« PoprzedniaDalej »
January 10, 1879. ditions which C. Bernard seems to have met with in the Hæmocyanin, a New Substance from the Blood experiments, the account of which has unfortunately of Octopus vulgaris.-L. Fredericq.—The liquid porreached us in so imperfect a manner. Nevertheless, I tion of the blood of the cuttles contains a colourless considered it useful to science to publish them, such as albumenoid substance, forming with oxygen an unstable they are, with the object not of opening a controversy but compound of a deep blue colour. This substance plays, of pointing out a new path for research.” By simulta. in the respiration of the cuttles, the same part as does neously hydrogenising and oxidising sugar M. Berthelot hæmoglobin in that of the Vertebrata. The veinous has in fact succeeded in producing alcohol, though in bloc of the cuttles is colourless, but the arterial is a dark very small proportions. He considers that his present blue. If hæmocyanin is ignited it leaves an ash rich in results do not warrant a definite conclusion, for the limit copper, which seems to be in the same condition and to may be due as much to the inaccuracy of the fundamental fulfil the same fundions as does iron in hæmoglobin. hypothesis as to the imperfection of the conditions.
Influence of the Different Colours of the Spectrum Still, he considers the fact that alcohol has been produced in the cold by the electrolysis of a solution of sugar merits ring to earlier researches on this subject the author states
on the Development of Animals.-E. Yung.- Refer. to be placed on record.
that M. Beclard placed the eggs of Musca carnaria under Novel Phenomenon of Static Ele&ricity.- E. glasses of different colours, and remarked that they were Duter.-In reply to the memoir of M. Govi (December 2) developed very unequally, those under the blue and the author does not admit that his researches can be violet ray being the most developed, and those under the viewed as a continuation of ihose of the Italian physicist. green ray the least so. He arranges the rays, as regards
Artificial Production of Nepheline and Amphi-the development of larvæ, in the following order :-Violet, gene.-F. Fouqué and A. Michel Levy.-These minerals blue, red, yellow, white, green. The author has carried Kave been obtained by the same method used by the the common and esculent frog, of the trout, and of
on for three years a series of observations on the eggs of authors for the reproduction of felspars.
Lymnea stagnalis. These eggs were placed in vessels Spearometric Measurement of High Tempera- plunged respe&ively into violet, blue, green, yellow, red, tures.-A. Crova.—The spectrometric study of the and white solutions, whilst one vessel was kept in a dark luminous radiations emitted by incandescent bodies has closet. Violet light accelerates the development in a led the authoi to the discovery of a new method of deter: remarkable manner, and is followed in this respect by the mining elevated temperatures by the analysis of the light blue, the yellow, and the white. Red and green light which they emit. If we take, in the continuous spectra appear injurious, as the author was not able to obtain the of light emittted by two incandescent sources, the one of complete development of ova in these colours. Darkness known temperature, T, and the other of unknown tem
did not hinder development, but retarded it, contrary to perature, x, two simple radiations of very different wave
the results of Higginbottom and MacDonnell. The lengths, 1 and X', to which we may reser all our measure.
colours may be arranged in the following series of ments, and determine by means of a spectro-photometer diminishing activity:-Violet, blue, yellow, and white the ratios
(which are nearly equal). darkness, red, and green. and
Tadpoles deprived of food died more rapidly of inanition T
under the violet and blue rays than under the others.
The general mortality seemed lowest in white light. of the intensity of the two rays 1 and X'in the two spectra. The quotient of these two ratios represents the ratio of the intensiies of the ray ' in the two spectra when the more intense has been lowered so as to give the same
Gazzetta Chimica Italiana. intensity to the ray 1 in the two spectra.
Anno viii., 1878. Fasc. vi. and vii. Specific Heat and Melting Temperature of Palla
Crystalline Form of Usnic Acid.-P. Freda.- The dium.-J. Violle.—The mean specific beat of palladium same remark applies to this memoir. at 100o = 0'0592. Its melting temperature is 1500°. Preparation of Digallic Acid.-Dr. P. Freda.-A
Influence of Temperature on Rotatory Magnetic criticism on the method proposed by Prof. Hugo Schiff. Power.-J. Joubert. ---In the author's experimenis the The author finds that on heating gallic acid with arsenic rotatory power was found to increase with the rise of acid, whether in alcoholic or aqueous solution, a substance temperature.
is obtained having some reactions similar to tannic acid.
This substance constantly contains arsenic acid, and if Density of Coefficients of Expansion of Liquid this is removed the compound is re-converted into gallic Chloride of Methyl.-MM. C. Vincent and Delachanal. acid. -The sp. gr. at - 2397° = 0.9945; at +39° 0.87886. The values lound for the three coefficients a, B, 7, respec-Derivatives.-L. Balbiano.- The derivatives are oxy
On a-Iso-chloro-butyric Acid and some of its tively, are o‘00193929, 0'00000183121, and o'000000105916.
iso- ric, metacrylic, and dibutylatic acids, Oxidation of Certain Aromatic Derivatives.-A. Etard.--On exidising various organic compounds by 1 and Musts.-Prof. E. Pollacci. -Sulphate of lime reacts
New Phenomena Observed in “ Plastering” Wines means of chromic chlorhydrine, the author observed very solely upon the cream of tartar, producing acid sulphate different reactions, and sound that its mode of action is principally regulated by the nature of the body acted of potassa, which remains in solution, while tartrate of upon and by that of the substituted groups which it con
lime is formed and is chiefly deposited. The reaction tains. Thus there are formed acetons, aldehyds, and between the two salts is not complete, since there may be quinons, whilst hydrochloric acid, or even chlorine, is found in the liquid both sulphate of lime and cream of liberated as an accessory product ; in other cases there is
If the gypsum is in large excess a part of it is no escape of gas, an immediate and total combination deposited among the tartrate of lime. being formed.
Nature of Certain Crystalline Secondary Products Obtained in the Industrial Treatment of Pennsyl.
Les Mondes, Revue Hebdomadaire des Sciences. vanian Petroleum.-L. Prunier and R. David.-Among
No. 14, December 5, 1878. these accessory products are found the carburetted deriva. Agoraphobia.-Dr. Legrand du Saule.—The author tives of acetylen and benzin (anthracen, chrysen, &c.) has studied a novel nervous affection, which manifests discovered in the products of the distillation of coal, itself in a dread of open spaces.
'} Chemical Notices from Foreign Sources. January 10, 1879.
23 Biedermann's Central-blatt.
Stag: Fallow deer.
Ox. Heft 12.
51'96 52'29 52'13 31.60 Magnesia
3.60 Researches on the Influence of Artificial Manures
42:19 41:41 40:60 12.60 upon the Growth of Summer Barley.-Dr. G. Marek.- Carbonic acid
2:29 2'98 The author conludes that on fruitful soils artificial ma.
0:561 nures are untrustworthy for barley. Unmanured plots Soda
0:89 5:50 often yield better results than such as are manured.
Sulph. acid 0:18
6.80 Experiments with Sugar Beets in Different Soils Fluorine 1'56 I'48 1.96 and with Different Manures.-Dr. J. Hanamann.- Silica
I'90 The author draws no conclusions from his experiments. Ferric oxide
20'30 (?) Composition of Wool and Hair.-P. Schutzen. Carbon
1'36 berger.-From Comptes Rendus, 1878, pp. 767.69.
On Certain Animated Enemies of Cultivated Plants and their Destruction.--M. Schaefer.--An ac
MISCELLANEOUS. count of certain insects hostile chiefly to the vine. Among the remedies proposed are sodium sulphide, petroleum, and a mixture of an alcoholic extract of tobacco, with bi
Russian Scientific News.-At the Technical Society sulphide of carbon.
of St. Petersburg M. Latchinoff delivered a very interesting Wine-Testing and Chemical Analysis.-Drs. e. lecture on the electric light. He made some experiments Mach and Patele.-The authors show that wines on
with Jablochkoff's condensators, which consist of a set of analysis often display properties not suspected from their tin plates placed one on another; the surface of every
Between every pair of such taste. Sorts rich in alcohol are often pronounced light, plate is oʻ7 square metre. and others strongly acid seem mild, &c. These seeming plates a piece of silk covered with varnish is introduced.
On contradictions are due to the fact that wine is a most com
The height of the condensator was about 6 feet. plicated liquid, whose components are hy no means all introducing two condensators into a circuit the intensity known. Even among the recognised and more prominent not cheap owing to the great quantity of silk wanted, and
of the electric light is doubled. Such condensators are ingredients, it is not so much the quantity of one or the other as their relative proportion which determines the
thus the application of this apparatus is limited. The flavour.
lecturer believes the new system of electric lighting de
vised by M. Rapie ff to be a serious opponent of Jabloch. On the Influence of Temperature in Malting:-A: koff's process. The chief advantage of the new system is Prantl and Hans von der Planitz.-Not susceptible of that the luminating point does not change its position, and useful abstraction.
therefore this system is more suitable for the projection of Oino-Chemical Researches:-Dr. M. Buchner.-In the electric light at a distance. This advantage will give order to solve the question whether a given wine is natu- increase to the use of the electric light for military ral or fictitious, in the former certain proportions pre- purposes. vail between the quantities of extract, alcohol, and ash. M. Greegorieff, of the Petrovsky Agricultural Academy If the relative proportion of these constituents vary from of Moscow, has made some interesting experiments con. the normal standard, or if the total is too high or too low, cerning the quality of milk sold in various places in the the case is suspicious.
city of Moscow. In large towns of Europe the falsifica. A Source of Error in the Determination of Fat in tion of milk has given rise to a great number of investiga. Milk.—Dr. L. Maneth and Dr. G. Musso. The authors tions, and this question was discussed in detail. It maintain that if milk, evaporated down along with sand, appears that in Moscow the milk sellers mix water very is extracted with ether, the ether driven off, the residue moderately in a few cases, and have altogether little again extracted with ether and driven off, ard the final knowledge about the “ chemicals,” viz., chalk, starch, residue extracted with sulphide of carbon, there remain flour, &c. In all the samples analysed, no such “checertain strongly acid drops, of a yellow or deep red colour, micals were present. The 64 samples of milk were soluble in ether and water, but insoluble in fat or in suls taken from the following places in Moscow :-Samples phide of carbon. At 100° they take a darker colour and A, from peasants living in the vicinity of the town (17); become almost resinous. The authors consider them as samples B, milk from the town cows (6); samples C, from impure lactic acid. In recent milk there is little of this small grocers' shops (14); samples D, from milk shops (22); substance, and hence there is very little difference be samples E, milk of the Academical farm. tween the weight of the residue from the original extrac- The following are the average results of the analyses tion with ether and that of the residue from the evapora of these milks :tion of sulphide of carbon. There is more difference in old
Samples, milks, and especially in cheese. The authors state that in milk evaporated to dryness at high temperatures there Water
88:13 88.08 89 16 87.48 87'53 occurs a wax-like matter, sparingly soluble in ether, Dry substance.. II87 11'92 10:84 12:52 12-47 which greatly impedes and protracts the process of extrac- Fat
2976 2:39 1:55 3:13 4'10 tion. (The editor of the Milch-Zeitung, from which the Mineral substance ..
0*79 071 0:69
0:67 above paper is taken, does not find a double extraction of As compared with an average analysis of noimal milks the milk residue with ether requisite. If a proper appa- from healthy cows, the first four samples cannot be called ratus is used, the first ethereal extract is perfectly clear, bad specimens. For comparison the following analysis and leaves on evaporation clear fat, in which no drops of
(average) may be mentioned :foreign matter are present).
87'25 Investigations on the Nitrogenous Food of Fungi.
12'75 -Th. Schlösing and A. Müntz.-From the Comptes
3:50 Rendus, 1878, p. 892.
0°75 Analysis of Stag and Roe Horns and of the Horns These results were obiained by Fleischmann (Molkereiof an Ox.-Prof. W. Vesely.-Stag, 50-480 ash, 7-88 wesen, 1876). The milk of the Academical Farm (sample moisture; fallow-deer, 50-640 ash, 898 moisture ; roe, E) is certainly a very high and good specimen ; such 47-830 ash, 9:42 moisture; ox, 1°167, 8.75 moisture—the milk will never be found in the hands of the sellers. difference in each case being organic matter. The ash
S. KERN, M.E. contained :
| St. Petersburg
CHEMICAL NEWS, Composition and Quality of the Metropolitan Water.
January 10, 1879. COMPOSITION AND QUALITY OF THE METROPOLITAN WATER.
The following are the returns of the Society of Medical Officers of Health :
Hardness on Clark's Scale.
2 foot Tube.
Nitrogen as Ni
Oxygen used to
Grs. Grs. Grs.
Grs. Grs. Degs. Deg
0'000 0:010 0·180 0'075 23.70 8.400 0.684 0:64 1.240 15'9 4'00 West Middlesex
0'000 O'oro O'ogo 0'089 23:30 7.800 0648 0°72 1.860 14:3 4:20 Southwark and Vauxhall Clear
0.000 0.006 Oʻ120 0115
7110 0*720 0*72 1'400 14'3 4.60 Chelsea
14:8 5'10 Lambeth.
0'000 0·010 0 105 0·103 22'00 7040 08576 0.72 1.630 14:3 5:10 Other Companies. Kent..
0'000 0.002 0'360 0'002 29.50 11'560 1'081 1:152 3.300 17.6 5'10 New River
14:8 4:20 East London
14:8 510 The quantities of the several constituents are stated in grains per imperial gallon. NOTE.—The amount of oxygen required to oxidise the organic matter, nitrites, &c., is determined by a standard solu. tion of permanganate of potash acting for three hours.
C. MEYMOTT TIDY, M.B.
MEETINGS FOR THE WEEK.
QUARTERLY JOURNAL OF SCIENCE. MONDAY, Jan. 13th.--Medical, 8.30.
i ondon Institution, 5.
Edited by WILLIAM CROOKES, F.R.S., &c.
Now ready, No. LXI., January, 1879, price 58.
I. On the Thickness of the Antarctic Ice, and its Relations to WEDNESDAY, 15th.-Meteorological, 7.
that of the Glacial Epoch. By James Croll, LL.D., F.R.S. Society of Arts, 8. " Economy and Safety by II. Gravitation as a Facior in the Organic World. By William the Use of Automatic Couplings on Rail.
Crookes, F.R.S. ways," T. A. Brocklebapk.
III. Sanitary Science in the United States : Its Present and its THURSDAY, 16th.-Royal, 8.30.
Future. By Albert R. Leeds, Ph.D.
IV. The Course of Nature. By Prof. Simon Newcomb.
V. •Peruvian Antiquities. By E. R. Heath, M.D.
Notices of Scientific Works, Obituary, &c.
Society of Arts, 8. Afghanistan," Ć E. D. Black.
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Situation wanted by a Competent Analyst as
I C.C. =
25 copper are diluted to 1 litre.
0.010131 grm. THE CHEMICAL NEWS. Na FeCyo.) Τ
This process, from its extreme simplicity, will commend
itself for approximate comparative examinations. VOL. XXXIX. No. 999.
The ferrocyanide of copper, if present in larger quantities than those indicated above, hides too much the blue colour of the Prussian blue, and must be separated before
applying the ferrous sulphate. Moreover, in concentrated ESTIMATION OF CYANOGEN IN SODA-LYES. solutions, the precipitate of ferricyanide of copper contains
more cyanogen per atom of copper than the formula By FERD. HURTER Ph.D, F.I.C
CuzFezCy12 requires. In dilute solutions, however, the
amount of copper solution required is such as to corresTHE cyanogen compounds which occur in soda-lyes are
pond sufficiently close with the formula above stated; and the following:
considering that not one of the many other compounds Sodium ferrocyanide,
contained in soda-lyes interferes with this process of Sodium sulphocyanide,
estimating the cyanogen, it will rival in accuracy any Sodium cyanate.
other volumetric process devised for this purpose.
If it is apprehended that the solution under examination Though in crude soda (black-ash) the cyanogen is con- contains cyanide of sodium beside ferrocyanides, it must tained as cyanides, the soda-lye obtained therefrom con- first be boiled with a small quantity of ferrous oxide, protains no cyanides. During the lixiviation the cyanides duced by adding a little ferrous sulphate. The solution are transformed into ferrocyanides, and all the vat-liquors is then oxidised, acidified, and is ready for testing. I have yet investigated contained more iron in solution
The sulphocyanide is present in traces only. It can than the cyanogen would account for. If, however, approximately be estimated by acidifying the solution sodium cyanide is present at all it is readily converted under examination, adding some chloride of zinc to preinto ferrocyanide by boiling the liquid with freshly precipitate ferrocyanide of zinc. The solution is then filtered, cipitated protoxide of iron.
and the filtrate coloured by means of ferric chloride. In The most important of the cyanogen compounds to the a second vessel an equal quantity of ferric chloride, diluted manufacturer is the ferrocyanide, since this salt brings to the bulk of the solution under examination, is coloured into the solution a sufficient amount of iron to colour the by means of a solution of sulphocyanide of potasaium of finished product slightly brown.
known strength, until the tint of both solutions is alike. The sulphocyanide and the cyanate are practically of The amount of sulphocyanide thus consumed is in some no importance, as they yield colourless products of decom. degree a measure of thé sulphocyanide contained in the position during the further treatment of the soda. The lye, but this is usually so small that its estimation is of no chief problem to the chemists of alkali works, consists, practical utility. therefore, in the rapid estimation of the ferrocyanides.
Laboratory of Messrs. Gaskell, Deacon, and Co., The following method will be found exceedingly rapid,
Widnes, January, 1879. and sufficientiy accurate for solutions containing not more than 2 grms. of sodium cyanide per litre.
When soluble ferricyanides are mixed with salts of copper a yellow precipitate of ferricyanide of copper is ON THE COMBINATIONS OF AURIN WITH formed. If a proto-salt of iron is added afterwards a blue
MINERAL ACIDS.* precipitate will be formed so long as any ferricyanide exists still in solution. As soon, however, as all the
By R. S. DALE, B.A , and C. SCHORLEMMER, F.R.S. ferricyanide has been precipitated, the addition of a ferrous salt produces no longer a blue colour, but reacts upon the In our last communicationt we stated that by the adion ferricyanide of copper, reducing it to ferrocyanide of of acetyl chloride on aurin we obtained a colourless cryssimilar composition to that obtained on adding to an talline compound, which we intended to examine more excess of ferrocyanide of potassium a copper solution closely. We have since found that this body is identical gradually. The reaction is represented by the following with a compound which Gräbe and Carof obtained by the equation :
direct union of aurin and acetic anhydride and having the CuzFezCy12+2HCl+2FeCl2=Cu3H2Fe2Cy12+ Fe2C16.
We also mentioned that the purification of this subThis reaction suggests an indirect estimation of the cyano- stance was found to be beset with several difficulties. The gen compounds by measuring the amount of protoxide of cause of this was found out after some trouble, but at the iron which can be transformed into peroxide. It is not, same time we were rewarded by the discovery of a series however, this which forms the principle of the method now of remarkable bodies, consisting of combinations of aurin to be described, and which makes use of the above re- with mineral acids. action simply as indicator.
These salts, as we may call them, are beautiful bodies, 100 c.c. of the strong soda-lye are oxidised by means crystallising exceedingly well, and although some of them of chlorine, hypochlorite of soda, or, simpler, bleaching. are decomposed by water, they are very stable in dry air. powder sulution, until the whole of the sulphides, &c., are To their discovery we were led by the following observaconverted into sulphates, and the serrocyanide into ferri- tions. cyanide; the solution, after being acidified and freed as
On heating aurin with glacial acetic acid and acetyl much as possible from excess of chlorine by warming and chloride, the crystals lose at once their steel-blue lustre agitating, is ready for titrating.
and assume a pale red colour. To obtain the compound On a porcelain slab sprinkle a few drops of a dilute thus formed in a pure state, acetyl chloride was added to solution of ferrous sulphate (1 part of ferrous sulphate to a saturated solution of aurin in acetic acid. The liquid 100 parts of water). Add now to the solution to be assumed at once a much lighter colour, and soon pale red analysed a twentieth normal copper solution from a burette needle-shaped crystals having a diamond lustre separated until a drop of the solution, on being brought in contact out. On re-crystallising these repeatedly from alcohol with a drop of ferrous sulphate solution, no longer gives a blue colour, but yields the pure purple colour of cupric * Read before the Manchester Literary and Philosophical Society serrocyanide. The copper solution is prepared by dis.
December 10, 1878.
+ Proc. Lit. and Phil. Soc., 1878, 141, and Chem, News, vol. xxxvii., solving pure metallic copper in as little nitric acid as possible, and diluting with distilled water. (3:17 grms. of i Ber. Deutsch. Chem. Gesell., xi., I, 122.
January, 17, 1879. we obtained oblong six-sided plates, which, as analysis | easily takes piace, pure aurin being left behind, but it apshowed, were pure aurin.
pears to be quite stable when exposed to the air, and even On treating the original crystals with water they become on heating it with water no sulphur dioxide is given off, dull and brownish red, the solution containing acetic and but a drop of sulphuric acid added to the mixture is suffihydrochloric acids. It therefore seemed not improbable cient to evolve the gas abundantly. Aurin sulphite has that an additive product of aurin and acetyl chloride had the composition (C19H1403)2SO3H2+4H20. been formed, containing, however, also acetic acid, as a As we have already shown, aurin forms very charactersuperficial examination showed that the liquid contained, istic compounds with the acid sulphites of the alkali to one molecule of hydrochloric acid, much more than metals; which, in accordance with the newly established one molecule of acetic acid. We therefore tried to obtain formula of aurin, must now be written as follows:an analogous benzoyl compound, and to determine in it,
C19H403,SO2KH after decomposition with water, the relative quantities of
C19H4O3.So NaH hydrochloric and benzoic acids.
C19H1403,SO3(NH)H On adding benzoyl chloride to a hot solution of aurin in acetic acid, similar crystals as before were obtained,
We have also found that rosolic acid, or the next higher which, after being dried on filter-paper in dry air, were homologue of aurin, forms compounds with mineral acids decomposed by water, but only hydrochloric and acetic which crystallise well. Being, therefore, a base like aurin, acid went into solution, and on heating the product with
we think its name ought to be altered, and, as it has only water or alkalies but a mere trace of benzoic acid could be been obtained from rosanilin, propose for it the name detected.
rosaurin. These facts, coupled with the observation that the bright red needles which, as we stated in our former paper, are formed by crystallising aurin from hot aqueous ON THE INFLUENCE OF CHLOROFORM ON hydrochloric acid, retain the latter obstinately, led us to
NITRIFICATION. the conclusion that this acid forms a definite compound with aurin.
By OTTO HEHNER, F.C.S., F.I.C. Such a body could be formed under the above conditions, as our glacial acetic acid contained a little water. More- NITRIFICATION, according to Schlösing, Muntz, and over, Mr. Charles Lowe had informed us that the splendid | Warington, is prevented by chloroform. specimen of aurin which he exhibited at Paris was obtained The following experiments tend to prove that this is the in the following way :—The crude but crystalline aurin, case only when a relatively large amount of chloroform is which is obtained by heating pure phenol with sulphuric employed, small quantities not only not preventing nitri. and oxalic acids, was dissolved in alcohol and some strong fication, but actually favouring the developnient of bacteria hydrochloric acid added, by which a crystalline precipitate and the reduction of nitric acid into ammonia. was formed, crystallising from hot acetic acid in beautiful In a paper read before the Socie:y of Public Analysts red, glistening, flat needles. He was kind enough to give I have shown that on keeping ordinary drinking-water us a sample, and on examining it we found that water for some length of time the nitrogenous matter breaks acted upon it in the same way as on our crystals.
up with the formation of ammonia, which in its turn In order to prepare a pure compound for analysis, a hot gradually changes into nitric acid. solution of aurin in acetic acid was saturated with hydro- Attempting to arrest these changes by the addition of chloric acid gas; the colour of the liquid changed into a chloroform to polluted water, I was struck with the rapid light yellowish red, and soon the compound separated out development of bacteria in those samples which had re. in glistening needles, which, even when perfectly dry, smell ceived but small additions of chloroform, the samples bestrongly of acetic acid. When exposed to the air they soon coming quite turbid and opalescent. assume a steel-blue lustre, and gradually crumble into a To 24 litres of a water polluted with putrid urine, reddish brown crystalline powder. The same properties yielding per 100,000 partsare shown by the crystals obtained from acetyl chloride
Free ammonia and those obtained from Mr. Lowe. When heated to 110°
Albuminoid ammonia in a current of dry air they gradually lose all the acetic
0·0205 acid, which plays the part of water of crystallisation, and 0-5 c.c. (2) and 1 c.c. (3) were added. After the lapse of assume a dull red colour.
three weeks sample 1 (without chloroform) ehowed On passing hydrochloric acid gas into an alcoholic solu
0'0007 tion of aurin, similar but smaller needles are formed, con
O'0065 taining alcohol, which is given off at 100°. The dull red Whilst (2) yieldedresidue can, like the preceding one, be heated to 100° in a current of dry air without losing hydrochloric acid, which
O‘0992 only begins to escape at 200°.
0-0480 Analysis of these compounds showed that the dried And (3) substance consists of C19H1403, HCl, while the crystals Free ammonia obtained from an acetic acid solution have the composi. Albuminoid ammonia tion C19H1403, HCl+2C2H,02, and those from alcohol
0.0659 2C10H 1903, HC1+3C2H60.
Both (2) and (3) were very turbid when last analysed. When sulphuric acid is added to a hot alcoholic solution
To samples of 8 litres each of another water, containing of aurin, small red needles are formed on cooling, which some putrid urine, 2 and 5 c.c. of chloroform were added. consist of (C19H1403)2SO4H2+alconol.
Under the same
On January 18, 1878, the day on which the experiments conditions an acetic acid solution yields fine prismatic
were commenced, the samples showedcrystals or flat, very glistening needles, which are an acid Free ammonia
0'0239 sulphate, its formula being C19H1403, S04H2+acetic acid. Albuminoid ammonia
0'0430 We have also prepared a nitrate which is readily formed on February in the sample without chloroform had and crystallises well, but have not analysed it yet. In our first communication to the Chemical Society we
Free ammonia described a compound of aurin and sulphur dioxide, which
Albuminoid ammonia is easily obtained in bright red crystals by passing sulphur
0'0244 dioxide into a saturated alcoholic solution of aurin. "Our Whilst the water with 2 c.c. of chloroform containedformer observation, that this body contains water but no Free ammonia ..
O‘2017 alcohol, we found confirmed; on heating it decomposition Albuminoid ammonia