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The Institute of Chemistry.

lighting is consequently entirely obviated. Not only this, but one, two, three, or the whole of the four candles may be lighted or extinguished at will simply by turning the handle of the commutator, or if one goes out it re-lights itself automatically without extinguishing its neighbours. It would, of course, be premature to speak of the cost of permanently carrying out this immense boon to students and literary men generally; we may, however, mention that a reduction has recently been made in the price of the ordinary ninety-minute candles of something like 40 per cent. That the innovation is already highly appreciated is shown by the large attendance of real workers on the three evenings in question, and by the almost unanimous chorus of approbation indulged in by readers of all classes. The Société d'Electricité deserves great credit for the public spirit they have shown in gratuitously supplying everything necessary for making this interesting experiment.

Mr. Bond and his able coadjutors seem determined to extend the use of the treasures under their charge in every possible direction, and it ought to be the duty as well as the pleasure of the literary, artistic, and scientific press of this country to strengthen their hands by generously commending and seconding their well-intentioned efforts.

CHEMICAL NEWS,
March 7, 1879.

attraction by a magnet. The portion separated was again
reduced to powder, and the magnetic portion again
separated, and so on till no non-magnetic residue remained.
The magnetic portions all had almost the same specific
gravity, and after deduction of a silicate of ferroso-ferric
oxide, Fe3O4.2SiO2, the residue was found to approach
the composition of a spinel, composed of an oxide of the
formula M203.MO. This residue was magnetic, when
iron constituted either one or other of the oxides, the re-
maining oxide consisting of alumina or lime.
Mr.
Hannay's conclusion, therefore, is that such a mixed
oxide, or spinel, may possess magnetic properties when
associated with magnetic silicate of ferroso-ferric oxide.

EDINBURGH UNIVERSITY CHEMICAL SOCIETY
February 12, 1879.

Mr. GEORGE MACGOWAN, F.R.S.E., in the Chair.

A PAPER was read by Dr. W. INGLIS CLARK "On the
Action of Chlorinated Substances on Alcohol," in which
he described the practical method of preparing chloroform,
and the chemical reactions which most probably occur in
its formation.

PROCEEDINGS OF SOCIETIES.

PHILOSOPHICAL SOCIETY OF GLASGOW.

CHEMICAL SECTION.

Ordinary Meeting, February 10, 1879.

Mr. J. J. COLEMAN in the Chair.

THE first paper was read by Dr. JOHN CLARK, "On the Action of Phosphuretted Hydrogen on the Animal Organism." His experiments were carried out in conjunction with Dr. Henderson. Small animals, usually rats, were introduced into the jar. There appeared to be considerable difficulty in breathing, and itchiness of the skin. Death took place usually within half an hour. A very small amount of gas has a fatal action; even I part in 5000 causes death. The blood was dark and venous, and the | lungs inflamed. Portions of the liver and blood were tested for phosphorus compounds by introducing them into a flask in which hydrogen was being evolved from zinc and hydrochloric acid. The flame of the hydrogen had a green colour, and exhibited a spectrum of green bands, characteristic of phosphorus.

Mr. TATLOCK read the second paper, "On Magnetic Iron Sand from the Kyles of Bute." This sand forms black streaks on the Argyleshire shore. It is separable into two portions by the magnet, both of which have the same appearance and crystalline form; one is magnetic, and the other not. On analysis the magnetic portion was found to contain 83.55 per cent of Fe3O4 and 15.6 per cent of Fe2O3; and the non-magnetic portion contained 067 per cent of Fe3O4, and 97 64 per cent of Fe2O3. If the magnetic variety had been oxidised to the nonmagnetic variety no disintegration of the crystal had taken place.

The last paper was read by Mr. J. B. HANNAY. The subject was, "Variation in the Magnetic Constituents of Minerals." It has been observed that many rocks are feebly magnetic. The author's method of determining the amount of this magnetic attraction has been elsewhere described. It consists of suspending a sample of the rock to the beam of a balance, and determining the amount of oscillation produced by a magnet placed above the pan. The magnetic constituents of these rocks, conprising specimens of pyrochlor-obsidian, natrolite, rhodonite, and gneiss, were separated by pulverisation and

CORRESPONDENCE.

THE INSTITUTE OF CHEMISTRY.

To the Editor of the Chemical News.
SIR. When the Institute of Chemistry was first proposed
the promoters gave great offence by holding hole-and-
corner meetings of their personal friends, instead of in-
serting an advertisement in your columns asking all pro-
fessional chemists to meet together and discuss their
mutual wants with a view of forming an association.

Whatever excuse there might have been at that time
for such a course of procedure, it is surely unnecessary
and undesirable to continue the same system.

Throughout the year 1878 the Members of the Institute heard of absolutely nothing being done by the Council to advance the interests of the profession, until in December just before the new subscriptions fell due-the Institute showed a faint sign of life, and a meeting was held, at which the important subject of " Trade Certificates discussed.

was

This seemed a step in the right direction, and we looked forward anxiously for a verbatim report of the proceedings. With a large number of Members scattered all over the kingdom, and with ample funds for the purpose, our Council surely could not have contemplated anything less.

Judge then of the disgust of myself and other subscribers when it leaked out that the executive dared not publish a report of the meeting because nearly all the speakers upheld the system of giving certificates for advertising purposes. They were expected to curse, but verily they blessed them altogether. But why should the discussion not be published? Have the executive discovered that they have been cherishing a snake? Are some of the worst sinners to be numbered amongst the very elect, i.e., the Council of the Institute of Chemistry of Great Britain and Ireland?

Now, Sir, I protest against this hole-and-corner business. Every Fellow of the Institute has a right to know all that occurs at the public meetings of his society, and the attempt to prevent publicity of discreditable proceedings will, if persisted in, speedily prove the ruin of the Institute.

In a few days' time a second conference will be held, at which the subject of the "Adulteration of Food and

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Drugs" will be discussed. While deprecating the choice of Dr. Voelcker as the leader of the discussion-for, eminent as he is in his own department, his opinions command no respect among those chemists who have had special experience in the examination of food and drugs -it is to be hoped that his speech and that of all others who take part in the debate will be fully reported and circulated among the Members.

As the Council of the Institute allowed the year 1878 to pass without moving a finger to advance the interests of the profession, and as there are ample funds in hand, I had hoped they would have had the discretion not to make any call for 1879. As it is, I shall wait to see what the "Government Programme" is before I pay my subscription, and I hope the other Members will do the same. In short, I challenge the Council to show what they intend to do with the money now in hand.-—I am, &c., A DISGUSTED Promoter.

THE BESSEMER PROCESS FOR TREATING SULPHIDES.

To the Editor of the Chemical News. SIR,-With reference to the remarks on my experiments in the CHEMICAL NEWS, vol. xxxix.. p. 94, that "The analyses made seem to show that in the regulus obtained there is often much less sulphur than corresponds to the formula FeS-a fact that points to a lower sulphide of iron than any hitherto recognised," Is it not possible the excess of iron present may be accounted for in another way, viz., by the presence of metallic iron?

to add one or two remarks which I omitted on the occasion referred to. I drew attention to the fact that Prof. Dittmar had very carefully described the details of a method of burning water residues in the CHEMICAL NEWs about a year ago. I stated that, having tried this method upon some ten or twelve waters, I had found it yield very accurate results. These waters contained exceedingly small quantities of any solid constituents, and especially little organic matters. I described then the process as I had used it, saying that the nitrogen was burned with soda-lime in a current of hydrogen. Will you allow me to add that the ammonia, instead of being collected in acid, was absorbed by pure distilled water, and with perfect condensation. Prof. Dittmar mentions the constant presence of ammonia in mineral acids, and I experienced a serious difficulty in attempts to prepare acids which, after neutralisation with pure sodic carbonate, would not give a strong colouration with the Nessler test.

The soda-lime used, both to absorb the carbon dioxide and to burn the organic matter for nitrogen, was prepared from pure soda and ignited marble. It was finely pounded, and passed through one sieve on to a finer one, so as to free the material from dust, and at the same time remove all pieces larger than a pin's head.

I believe this combustion process will satisfy the requirements of all those who have only an occasional need of such a method of analysis.-I am, &c.,

King's College, March 4, 1879.

W. N. HARTLEY.

I propose making the following experiment in a Bessemer CHEMICAL NOTICES FROM FOREIGN provided with a lime lining, viz.-To Bessemerise FeS with a hot blast and without adding silica, and I expect (provided the temperature is sufficiently high) that the

SOURCES.

protoxide of iron formed will react on the protosulphide NOTE.-All degrees of temperature are Centigrade, unless otherwis of iron and produce metallic iron with the evolution of sulphurous acid.—I am, &c.,

JOHN HOLLWAY.

7, Jeffrey's Square, St. Mary Axe, London, E.C., March 1, 1878.

ALUM IN FLOUR AND BREAD.

To the Editor of the Chemical News.

SIR, Mr. Penney, in his article on "Alum in Flour and Bread" (CHEMICAL NEWS, vol. xxxix., p. 80) remarks that the logwood test for alum is to be thoroughly relied on as a qualitative test if properly applied, and that it is of little consequence whether the solution is old or new. In this conclusion I quite agree with him, and I wish to point out a reason for its sometimes failing.

expressed.

Comptes Rendus Hebdomadaires des Séances, l'Académie de des Sciences. No. 5, February 3, 1879. Remarks on the Third Reply of M. Pasteur.-M. Berthelot.-A continuation of a stale and unprofitable discussion.

Fermentation of Cellulose.-P. Van Tieghem.-It does not seem that there is a diastase of cellulose formed in excess by amylo-bacteria and acting at a distance from it. Microscopic observations show that the solvent action of the amylo-bacteria upon cellulose is produced by direct contact. If the hypothesis of a diastase naturally offers itself to the mind to explain the first stage of the fermentation of cellulose and in general of the insoluble matters produced by living beings it must be recognised as not readily verifiable.

I have noticed that if the mixture of logwood and carbonate of ammonia solutions is allowed to stand a Liquefaction of Silicide of Hydrogen.-M. Ogier. short time before applying it to the flour or bread con--The author has performed this experiment with the taining alum, it imparts a dirty brown colour, and sometimes makes no change in the colour, according to the length of time it has stood, but if applied immediately it never fails to give the blue colour.—I am, &c.,

ALFRED J. M. Edger. Laboratory, 13, Dean Street, Newcastle-on-Tyne, February 27, 1879.

apparatus of Cailletet. At ordinary temperatures (about 10) liquefaction does not take place under pressures of 200 to 300 atmospheres. On the contrary, from 50 atmospheres the cooling due to the release determines the production of a thick mist and of a manifest trickling of liquid down the sides of the tube. Under these conditions the gas is at a temperature bordering upon its critical point. It suffices, indeed, to cool it a few degrees below zero in order to effect a total condensation. Hydric silicide is

THE DISCUSSION ON WATER ANALYSIS AT liquid at -11° at the pressure of 50 atmospheres; at -5°

THE CHEMICAL SOCIETY.

To the Editor of the Chemical News. SIR,-Will you allow me to repeat what I said at a recent meeting of the Chemical Society, since, from my words not being fully reported, an inaccurate statement was attributed to me, and, furthermore, because I should like

under 70 atmospheres; at -1° under 100 atmospheres, whilst at o° it remained liquid up to 200 atmospheres. The conditions of the liquefaction of this gas resemble those of marsh-gas, with which it has so many analogies.

Determination of Methylic Alcohol in Commercial Methylens.-C. Bardy and L. Bordet.-The authors point out the imperfections of the ordinary process founded on the transformation of methylic alcohol into methyl

Chemical Notices from Foreign Sources.

104 iodide. They effect the conversion in a special apparatus, a figure of which is inserted in their memoir.

The Wagnerite of Bamle in Norway, and on a Retinite from Russia.-F. Pisani.-Wagnerite, a fluoriferous phosphate of magnesia originally met with at Werfen, in Salzburg, is identical with a mineral subsequently discovered at Bamle, in Norway, and provisionally named Kjerulfine. The latter, however, contains a percentage of lime. The Russian retinite was formerly mistaken for a manganiferous garnet.

No. 6, February 10, 1879.

CHEMICAL NEWS, March 7, 1879.

remained limpid and neutral, and on microscopic examination showed no trace of any organised ferments, but it readily reduced cupropotassic reagent and turned yellow on boiling with acids. A special experiment with potassic ferricyanide showed that this reduction was due only in a small part to dextrin.

Determination of the Specific Gravity and Coefficients of Expansion of Liquid Methyl Chloride.MM. Camille Vincent and Delachanal.-Noticed in the Comptes Rendus.

Remarks on the Memoir of E. and O. Fischer on the Constitution of the Rosanilins.-A. Rosenstiehl.

On Fermentations, a Final Reply to M. Pasteur. The author considers it as established that there exist no -M. Trécul.

Fourth Reply to M. Berthelot.-M. Pasteur. Hydro-electricity and Hydro-magnetism: Experimental Results.-C. A. Bjerknes.-The author has examined the action between two pulsating bodies; between a pulsating body and another which oscillates; and between two oscillating spheres. In all these cases concordant pulsations produce attractions, and opposed pulsations give rise to repulsion.

The Green Phosphorescent Light of the Molecular Shock.-W. Crookes, presented by Th. du Moncel.-An abstract of a paper recently read before the Royal Society. Dissociation of Chloral Hydrate.-MM. Engel and Moitessier. The authors, along with M. Wurtz, and in opposition to M. Troost, maintain that chloral hydrate does not exist as a definite gaseous compound, and that its equivalent does not correspond to 8 vols. The dissociation is effected in an atmosphere of chloroform at 61°.

Researches on Beer-yeast.-MM. Schützenberger and Destrem.-Yeast digested alone at 30° for twentyfour hours lost 177 per cent of solid matters. If digested along with sugar there is an increase of solids amounting to 113 per cent on the weight of the yeast.

Homologues of Oxyheptic Acid.-E. Demargay.The author has prepared the following homologues :oxytetric, oxypentic, oxyhexic, and iso-oxyhexic acids. Analysis of an Ethiopian Honey.-A. Villiers. This honey, known by the natives as tazma, is found in subterranean cavities in Ethiopia, and is said to be collected by a species of mosquito. Its composition is :Water

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Process for Enriching Phosphates with a Carbonated Gangue.-L. L'Hote.-The author heats to bright redness so as to expel the carbonic acid, and then removes the caustic lime formed by lixiviation with very dilute hydrochloric acid. [To the best of our belief a substantially identical process has been for many years in occasional use at the Great Eastern Chemical Works, Stowmarket.]

Bulletin de la Societe Chimique de Paris, No. 1, January 5, 1879. Examination of some Mineral Waters of Auvergne. -E. Willm.-Not susceptible of useful abstraction.

Transformation of Starch into Glucose by Cold Water.-J. Riban.-The author had prepared, according to Mohr's directions, a solution of salted starch by boiling I part of powdered starch in 100 parts of water, saturating with common salt and filtering. After a year the solution became less and less sensitive to iodine, and after three or four years ceased to react with it at all. The liquid |

rosanilins containing in their molecule more than 20 atoms of carbon, and that there are three distinct rosanilins, viz., rosanilin-a, decomposable into aniline and paratoluydin, which MM. Fischer designate as pararosanilin, and prove that a single molecule of toluydin enters into its composition; rosanilin-ß, decomposable into aniline and orthotoluydin; the authors might call it orthorosanilin; they have not studied, it but confound it with the following. Rosarilin-a-ẞ (Hofmann's rosanilin), resolvable into aniline, orthotoluydin, and paratoluydin. M. Rosenstiehl at the outset of his researches considered this last comPound as a mixture of the two former, but subsequently was led to regard it as a well-defined chemical individual. The beautiful researches of E. and O. Fischer have removed all doubt on this point, and shown that it is the superior homologue of pararosanilin, and not its isomer. The second must be the isomer either of the first or the third.

No. 2, January 20, 1879.

Preparation and Properties of Potassic Cobaltocyanide and of Certain Derivatives.-A. Descamps.— Already noticed.

Memoir on the Curves of Solubillty of Salicylic and Benzoic Acids.-E. Bourgoin.-The curve of solubility of benzoic acid in water is analogous to that of salicylic acid. As far as about 35° the two curves are represented by parabola closely approximating, but above this temperature they change their nature, becoming modified in the same manner. Benzoic acid, which was at first rather more soluble than salicylic acid, becomes less soluble, so that the two curves intersect each other at 40°, at which point the solubilities are of course exactly the same.

On Laurent's Carminaphtha.-A. Guyard.— The author finds that this compound, whose existence has been doubted, may be prepared by dissolving at a gentle heat I equivalent or 128 grms. of naphthalin in a sufficient quantity of glacial acetic acid. On the other hand, 12 equivs. or 600 grms. of chromic acid are also dissolved in a sufficient quantity of cold glacial acetic acid. He then adds at a gentle heat the chromic solution to the naphthalin until the mixture takes a green tint, then, when all the chromic acid has been introduced, he boils for a few minutes. If the whole is then saturated with alkali, or an alkaline carbonate, and the liquid acidulated afresh, the carminaphtha is precipitated in red or brown-red flocks. He concludes that carminaphtha is really a product of the oxidation of naphthalin by chromic acid. When it is formed little carbonic acid is evolved, whilst when phthalic acid is produced carbonic acid is evolved in quantity. Carminaphtha is a very stable compound and dyes wool and silk a deep reddish brown without mordant, the shades thus obtained being less remarkable for beauty than for permanence.

Russian Chemical Society: Session of Nov. 2/24, 1878.-M. Wagner presented researches by MM. Schirokoff and Saytzeff on allyl-diethyl-carbinol, and a communication by M. Sorokine on the oxidation of diallyl and on the hexylic glycol thus derived. M. Barsilovsky sent a memoir on the azo-derivatives of toluen. A paper of M. Ponomareff's was read, on compounds belonging to the

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Nitrosalicylic Acids and the Isomerisms of the Benzol Derivatives.-H. Hubner.-A very extensive memoir, utterly incapable of useful abstraction.

Researches on the Non-saturated Acids (Second Treatise).—Rudolph Fittig.—This memoir, which extends to upwards of 100 pages, comprises :-Further contributions to the knowledge of fumaric and maleic acids, by C. Petri; investigations on the oil of Roman camomile, which, again, consists of a paper, by H. Kopp, on the organic acids obtained on the saponification of the above-mentioned oil; one by Julius Köbig on the several ingredients of Roman camomile oil; one by A. Pagenstecher on angelicic and tiglic acids; and a note by R. Fittig himself on the constitution of these two acids. The third grand division of the memoir is devoted to the non-saturated aromatic acids. Under this head R. Fittig and F. Binder describe the addition products of cinnamic acid; E. Posen treats of amido-hydro-cinnamic acid, otherwise known as phenylamido-propionic acid; R. Fittig and C. Wurster describe atropaic and isatropaic acid; and R. Fittig adds certain theoretical considerations on the formation of nonsaturated hydrocarbons from the addition-products of the non-saturated acids.

Halogen Substitution-Products of Ethan.-W. Stædel. The author describes the action of chlorine upon ethyl chloride, ethyliden chloride, ethylen chloride, dichlorethyl chloride, and mono-chlorethylen chloride, adding the remark that he has studied penta-chlorethan, and is at present engaged with hexa-chlorethan, his results on both which bodies will shortly appear.

Chloro-brom- and Brom-Substitution-products of Ethylen. Dr. J. Denzel.-The author describes the preparation and properties of a-chlor-brom-ethylen, a-chlordibrom-ethylen, a-dichlor-brom-ethylen, dichlor-dibromethylen, and the brom-substitution-products of ethylen. Nomenclature and Boiling-points of the Chlorbrom-substitution-products of Ethan and Ethylen. Dr. J. Denzel.-The most important part of this paper is a table of boiling-points.

Simple Apparatus for Regulating and Varying the Atmospheric Pressure in Distillations, Determinations of Boiling-Points, &c.-W. Stædel and E. Hahn.

Reduction of Analytical Weighings to a Vacuum. G. F. Becker.-These two papers require the accompanying plates. Becker lays down the law that the correction for the influence of the atmosphere decreases in proportion to the incresse of the square of the specific gravity.

Experimental Researches on Hydrogen Peroxide. -E. Schoene.-The author examines the behaviour of hydrogen peroxide with potassium iodide, a point of great importance for ozonoscopic observations. The author concludes from numerous careful experiments that perfectly pure hydrogen peroxide, whether in the state of vapour or in aqueous solution, and whether in a concentrated or diluted condition, liberates iodine from potassic iodide.

and on their Polymerisation.-L. Jawein.-Not susHexylens Formed from Tertiary Hexylic Alcohols ceptible of useful abstraction.

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Les Mondes, Revue Hebdomadaire des Sciences.
No. 6, 1879.

The Berlin Aniline Colour Company have issued a lengthy reply to the note by MM. Bindschedler and Bush on malachite green, inserted in the CHEMICAL NEWS, vol. xxxix., p. 61. They deny that a green dye can be industrially prepared from nitrobenzol and dimethyl-anilin by an oxidation process.

No. 7, February 13, 1879.

This issue contains a long account of the chemical manure works of M. Coquerel and Co., near Paris. This establishment, though only opened in 1874, sold, in 1877, six million kilos. of different manures.

MISCELLANEOUS.

The Royal Agricultural College, Cirencester.-The rumoured resignation of Prof. Church is incorrect. The Committee of Management of the Agricultural College are about to determine whether, after his marriage, he can retain his post without residing in the College precincts. Should this chair become vacant intending candidates may find the following extracts from the College Bye-Laws of some use:"XXI. The Principal shall exercise supreme control over all Departments, Moral, Instructional, and Domestic, and over the Library, Museum, Gardens, Laboratory, and Veterinary Hospital.

"XXII. He

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shall regulate the frequency and duration of the several Lectures and periodical Examinations, and all other matters of detail. "XXIV. The Professors shall be appointed by the Principal, and be removable by him.

"XXVI. No private tuition by Professors is allowed, without the previous consent in writing of the Principal, to be separately given in every case.

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"XXVII. The Professors shall be required to take a share in the maintenance of good order and discipline amongst the Students, subject to such regulations as the Principal shall appoint.

CHEMICAL NEWS,

{ March 7. 1879.

A Technical Laboratory in London (speciality

Coal-tar Products, Aniline Dyes, Anthracen, Artificial Alizarin) is open to receive two or three more Pupils for training in the technical and industrial pursuits.-Apply to M. 305, CHEMICAL NEWS Office, Boy Court, Ludgate Hill, London, E.C.

"XXVIII. All communications from the Professors and other officers of the College to the Council or Com-A Chemist of Nine Years' standing, with ex

mittee of Management shall be made only through the Principal."

The last Professor appointed has had to promise that he will engage in no literary work without leave from the Principal.

NOTES AND QUERIES.

Chromic Oxide.-Will any of your readers inform me how or where chromic oxide, as recommended by M. Audouin (Les Mondes, January 23, 1879) for fire-bricks, crucibles, &c., can be obtained at a

tensive experience in all branches of the Science, and who has devoted special attention to oils and fats, will be open to an Engagement in April. Highest references.-Address, A., CHEMICAL NEWS Office, Boy Court, Ludgate Hill, London, E.C.

A

Gentleman of business habits, with a good knowledge of practical chemistry, and well acquainted with several foreign countries, is desirous of an Engagement as Manager, with the view of becoming an active partner, in some well-established sound chemical works manufacturing acids, artificial manure, or aniline colours, and situated in or close to London. Highest references. Communications of principals or their solicitors only to be addressed to G. H., CHEMICAL NEWS Office, Boy Court, Ludgate Hill, London, E.C.

cost that would allow of its being used for such a purpose.-CRUCIBLE. The Advertiser, who has had many years'

MEETINGS FOR THE WEEK.

MONDAY, 10th.-Medical, 8.30.

Society of Arts, 8. "Dwelling Houses Their
Sanitary Construction and Arrangements," by
Dr. W. H. Corfield, M.A. (Cantor Lectures.)
London Institution, 5.
Royal Geographica 1, 8.30.

TUESDAY, 11th.-Civil Engineers, 8.

Royal Institution, 3.

Prof. Schäfer.

Anthropological, 8.

Photographic, 8.

WEDNESDAY, 12th.-Society of Arts, 8.

practical experience in experimental and analytical chemistry, is desirous of an Appointment, either in England or Colonies, as Chemist or Assistant.-Address, A. B. C., CHEMICAL NEWS Office, Boy Court, Ludgate Hill, London, E.C.

Young Man, at present engaged in a Tar

Work in Scotland, thoroughly experienced in manufacturing liquid ammonia, also sulphate of ammonia from gas liquor, and in refining of benzols and naphthas; with a knowledge of chemistry, German, and French, wishes to improve his position.-Address, S.H., Craigelea Chemical Works, Paisley.

"Animal Development," Wanted, Hydrated Sesquioxide of Iron (native)

"The Compensation of Watches, Clocks, and Chronometers," by E. Rigg, M.A.

Microscopical, 8.
Geological, 8.

THURSDAY, 13th.-Royal, 8.30.

Royal Institution, 3. "Sound," Prof Tyndall.
Royal Society Club, 6.30.

Society of Arts, 8. "The Injurious Effects of the
Air of Large Towns on Animal and Vegetable
Life, and on Methods Proposed for Securing
Salubrious Air," by W. E. Thomson, F.R.S.E.
FRIDAY, 14th.-Royal Institution, 9. "History of Games," by E. B.
Tylor.
Quekett, 8.
SATURDAY, 15th.-Royal Institution, 3. "Colbert and Richelieu," by
by Mr. Walter H. Pollock.

WATTS'S DICTIONARY OF CHEMISTRY.
Seven Volumes, 8vo., price £10 16s. 6d.

in powder or soft lumps. Must be nearly free from manganese or other impurities. Samples, with price per ton in casks, to be addressed"Ferrum," CHEMICAL NEWS Office, Boy Court, Ludgate Hill, London, E.C.

Wanted, Two Chemists, from this month to

the end of August, to take observations of the quantities of acid vapours present in the atmosphere surrounding a Chemical Works during the night and the day. Good references required.Address," Atmosphere," care of Lee and Nightingale, Advertising Agents, Liverpool.

TO SULPHURIC ACID AND CHEMICAL MANURE
MANUFACTURERS.

A Sailing Tank Barge to be Sold. Capable of

carrying 50 tons of acid; fitted with steam pumps; in good condition.-May be seen at Messrs. B. Jacob and Sons' Wharf, Copperas Lane, Church Street, Deptford, from whom all particulars can be obtained.

TO BE LET.-An Eligible Dwelling-House,

with Laboratory fitted complete; suitable either for a chemist in analytical practice or for classes in practical chemistry. Possibly a small incoming.-For full particulars apply to E. and S. Smith, Auctioneers and Agents, 22, Southampton Buildings, Chancery Lane,

A DICTIONARY of CHEMISTRY, and the w.c.

Allied Branches of other Sciences; founded on that of the late Dr. Ure. By HENRY WATTS, B.A., F.R.S.; assisted by eminent Scientific and Practical Chemists.

"The English language is not rich in lexicons of science. We would point to this work as a model upon which others might be framed. To the practical analyst this work must prove of the utmost value-to the philosophical investigator it must, as the record of all former labours, be a great gain-and to the student who is true to his studies, it will prove an ever-ready guide. Our manufacturers know the value of chemistry, and are many of them experts in the special branches of the science which bear on their particular industries. They require to know the latest discoveries, and to keep them as it

TO PAPER MAKERS, CHEMICAL MANUFACTURERS
AND OTHERS.

TO LET, at Low Rentals, Works and Land
in Plots of Two to Ten Acres, near Swansea. Coals obtainable
from 4s. 6d. per ton. Water good and abundant. Any description of
manufactory can be carried on. Excellent Railway, Canal, and Dock
accommodation close at hand.-Apply to Richard Hall, Esq., 37, Great
George Street, Westminster, or Mr. Thomas Williams, Aberdulais,
Neath, Glamorganshire.

were in stock until the march of improvement renders it necessary ORGANIC MATERIA MEDICA.

to apply them. This Dictionary' places them in possession of these desiderata."-Athenæum,

BY DR. MUTER.

Analytical Chemists will find this a concise and yet complete book of reference for the isolation and examination of the active principles

THIRD SUPPLEMENTARY VOLUME of drugs. Special appendix on the microscopic characters of the

(VOL. VIII.), completing the Record of Chemical Discovery to the year 1877. In Two Parts, of which the First is now ready, pp. 844, price 368. cloth.-Part II. in the Autumn.

"We cannot give this volume greater praise than by saying that it is worthy of the European reputation which Mr. Watts's Dictionary' has already acquired as a standard work of reference."-Bristol Mercury. London: LONGMANS and CO.

CULLEY'S PRACTICAL TELEGRAPHY. In One Volume, 8vo., with 132 Woodcuts and 18 Lithographic Plates of Machinery and Apparatus, Price 165.

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A HANDBOOK OF PRACTICAL TELE- ENGINE, its origin, history, and present perfection; and GAS, what

GRAPHY, By R. S. CULLEY, Member Inst. C.E. (Adopted by the Post Office and by the Department of Telegraphs for India.) The Seventh Edition, thoroughly revised and enlarged.

London: LONGMANS and CO.

it does and what it can do; both experimental and highly interesting lectures, by Mr. J. L. KING.-In preparation, a dioramic lecture of the ZULUS and their Country, by Mr. W. R. MAY.-Admission Is.; after 8.45 p.m. (including reserved Stalls), Is.; Schools and Children under 10, 6d. Open from 12 till 5, and from 7 till 10.

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