CHEMICAL NEWS, May 2, 1919 Contribution to the Chemistry of Tellurium Sulphide. content determined by the Lenher-Homberger (loc. cit.) method. Three samples were taken from this solution and placed in 300 cc. Erlenmeyer flasks. Concentrated hydrochloric acid was added till the samples contained 20 per cent, 10 per cent, and 5 per cent hydrochloric acid. These solu tions were placed in a thermostat carefully regulated at 25° C., and after they had attained that temperature, were treated with pure, dry bydrogen sulphide gas until precipitation was complete. In all cases the hydrogen sulphide caused the immediate formation of a dark red voluminous precipitate which increased in volume until most of the tellurium had precipitated, when it began to coagulate in small granules. Simultaneously with this decrease in volume, the colour gradually became darker until the tellurium had quantitatively precipitated as a black mass which settled to the bottom of the flasks. The precipitates were brought upon tared Gooch filters, washed with water containing hydrogen sulphide gas, followed by hot water, then dried in a vacuum over phosphorus pentoxide at room temperature, and weighed. The results obtained follow: 213 | various strengths, but_with_negative results. Although these experiments do not prove conclusively that no sulphide exists in the precipitate, it shows that no sulphide which either hydrochloric or hydrobromic acid is capable of decomposing exists in the precipitate. Amorphous sulphur is known to chemists in one form which is soluble and one which is insoluble in carbon disulphide. The insoluble amorphous modification, frequently known as gamma sulphur, can be produced by decomposing sulphur monochloride with water or by the interaction of hydrogen sulphide and sulphur dioxide. It would not be surprising, therefore, if the latter variety of sulphur were formed here in the decomposition of the tellurium-sulphur precipitate. The insoluble variety of sulphur may be converted into soluble sulphur by long boiling with alcohol or by sub. jecting it to a pressure of 8000 atmospheres. The latter method being impractical, the former was resorted to. The conversion was attempted inthe following manner:A large sample of tellurium sulphur was precipitated as usual and most of the sulphur extracted in a Soxhlet extractor with carbon disulphide. Then the carbon disulphide was removed carefully and the extraction con. tinued with absolute alcohol. By this means the precipitate was subjected to the action of hot alcohol and, at the same time sulphur was dissolved away as rapidly as it was converted to a soluble form. At the end of twenty-four hours of continued extraction, the alcohol had assumed a yellow colour, indicating that some sulphur had been removed from the precipitate. On dilution with water an opalescence confirmed the presence of a small amount of sulphur. The alcohol in the flask was replaced with fresh alcohol and the extraction continued. At the end of the The Extraction of Sulphur from the Precipitate.-A pre-second day the alcohol again became slightly opalescent cipitate obtained as above from a sample of tellurous acid containing about 5 grms. of Te was transferred to an extraction thimble and extracted in a Soxhlet extractor with carbon disulphide for twelve hours. Then it was freed of carbon disulphide by carefully washing with alcohol, followed by ether, and a sample was analysed for its sulphur content. This was accomplished by treating with nitric acid followed by fuming nitric acid in the cold until oxidation was complete. The solution was evaporated to dryness, the residue taken up in 8 per cent hydrochloric acid, and the sulphur determined by the usual gravimetric method. The results showed 1.36 per cent and 134 per cent sulphur retained by the tellurium, in fair agreement with the results obtained by Gutbier and Flury (loc. cit.). By a longer extraction with carbon disulphide these investigators were able to reduce this figure to 1.19 per cent. The experiment shows, however, that a carbon disulphide extraction of comparatively short duration will remove readily all but 135 per cent of the sulphur. Since, then, a small part of the sulphur does not dissolve in carbon disulphide, we may assume three possibilities regarding the chemical condition of this small percentage of sulphur. It may exist in the precipitate in chemical combination with the tellurium or, perhaps, with some undiscovered element more metallic in nature. Such an element would undoubtedly form a sulphide which would completely resist the action of carbon disulphide. Then, again, this sulphur may exist as a form of elementary sulphur that is insoluble in carbon disulphide, though no one appears to have considered this possibility. To test the two first possibilities, the following experiment was carried out:-A large sample of completely extracted material was treated in a large test-tube with I to i bydrochloric acid and water and gradually warmed. The test-tube was fitted with a one-holed rubber stopper, and the gases which came off were directed against a filter paper saturated with a solution of lead acetate containing a large excess of sodium hydroxide. Not the faintest coloration which would indicate hydrogen sulphide could be obtained. The experiment was repeated, using stronger hydrochloric acid and also hydrobromic acid of upon dilution with water. This process was continued for nine days, the used alcohol being replaced with fresh alcohol each day. At the end of this period, since the alcohol showed no trace of opalescence upon dilution with water, a sample was removed and analysed for sulphur. The analysis showed o'95 per cent and 0.96 per cent of sulphur present in the precipitate. Consequently the extraction was continued for one month. Samples were again removed and the sulphur determined; o'93 per cent and 0.96 per cent of sulphur still proved to be present in the precipitate. From these results it is evident that this small amount of sulphur does not exist in the free state, or, if so, in an extremely insoluble and inert form. The manner in which this sulphur exists chemically remains an unsolved problem. The Non-existence of TeS.-The work of Snelling (loc. cit.) at o° C. has been repeated in detail with only those changes found necessary to increase the accuracy of the results obtained. A sample representing o°2020 grm. of elementary tellurium was used. The solution was carefully cooled to o° C. by means of an intimate mixture of pulverised ice and water. The hydrogen sulphide, after being freed from hydrochloric acid gas and dried, was passed through a long coil condenser similarly cooled. After passing the gas into the sample for twenty minutes, 60 cc. of purified carbon disulphide cooled to o° was added. By a whirling motion the precipitate was completely forced into the carbon disulphide which occupied the bottom of the flask in which the precipitation was made. After standing in the freezing mixture for fifteen minutes, the carbon disulphide assumed a yellow colour and the precipitate became black and granular. The contents of the flask were brought upon a tared Gooch filter which had also been cooled to o° C. The precipitate was washed with water and dried in vacuo over P2O5. Te in sample, o 2020 grm.; required for TeS2, 0'3035; required for TeS, 0.2527 grm.; weights of Te and S found, 0'2540, 0'2537, and o°2542 grm. These results were of special interest since the weights of tellurium and sulphur found were always slightly higher than the weights required for TeS and considerably lower than those required for TeS2. A number of such determinations were made, and all tended to show that a compound containing more sulphur than TeS was at first produced. Assuming that TeS2 might be produced at first, a series of experiments was carried out in which the time elapsing between the first introduction of hydrogen sulphide gas into the solution and the final removal of the precipitate from the carbon disulphide was reduced from thirty-five to ten minutes. These results seemed desirable since the rapid change in colour taking place immediately after precipitation might indicate the gradual dissociation of the product first formed into its elements. Hydrogen sulphide was passed in for five minutes and the resulting precipitate extracted with carbon disulphide for five minutes. The results obtained furnished further evidence that TeS was not formed primarily. However, it was difficult to obtain uniform results, and it appeared that all the factors had not been taken into account. The two chief uncertainties were, whether the tellurium was completely precipitated in this length of time and whether the carbon disulphide was in contact with the precipitate a sufficient length of time to remove all free sulphur. A qualitative test of the filtrate showed small amounts of tellurium still remaining in solution, indicating incomplate precipitation. In order to determine the exact amount of tellurium in each case the Gooch crucibles containing the completely dissociated precipitates were extracted with carbon disulphide until they failed to lose weight. Since all but 135 per cent sulphur could be removed, the weight of tellurium in the precipitate was easily calculated. The use of this method made it necessary to determine whether tellurium itself was entirely insoluble in carbon disulphide. A series of extractions of precipitated tellurium with carbon disulphide in a manner exactly similar to the extractions given the tellurium-sulphate precipitate proved this to be the case. Consequently a series of experiments was carried out using carbon disulphide as the extraction agent. The exact weight of tellurium precipi. tated in each case was calculated from the weight of the completely extracted precipitate. The precipitates were allowed to stand in contact with the precipitate for exactly five minutes. The results of the experiments are given in the following table : — Wt. of Te. Required for Required for Wt. of TeS 0.2884 0.2891 S in Te-S ppt. Per cent. 32.18 3193 32°34 Besides explaining why it was impossible to obtain uniform results in the previous experiments, these results furnish more complete evidence that the original precipitate could not have had the composition TeS. In order to determine whether five minutes was sufficient time for all separated sulphur to be taken up by the carbon disulphide, the following experiment was carried out :Since bydrogen sulphide has no action on carbon disulphide it was found possible to have carbon disulphide present during the precipitation. This provided for a tenminute extraction of the greater part of the precipitate. Results of such experiments follow: clusion that the first product produced by the action of hydrogen sulphide upon aqueous tellurous acid solutions is not a compound represented by the formula TeS but must be a compound containing a greater amount of sulphur. One phase of the methods employed up to this point was not entirely satisfactory, namely, the use of a numerical constant in determining the actual weight of tellurium precipitated. An apparatus was consequently devised which permitted a gravimetric determination of the tellurium precipitated, thereby giving a direct instead of an indirect method for the determination. (To be continued). PROCEEDINGS OF SOCIETIES. SOCIETY OF GLASS TECHNOLOGY. THE Annual Meeting of the above Society was held on Wednesday, April 16, in the Applied Science Department of the University of Sheffield. Mr. W. F. J. WOOD, C.B.E., President, took the chair. After the annual report of the Society had been read, the Officers for the coming year were elected, Mr. S. N. Jenkinson, M.B.E., becoming the Society's new President. After the formal business had been dealt with, Mr. Wood gave a short presidential address, in which he spoke of the Research Association that had been formed in the glass industry. A provisional committee had been appointed, and at an early date all manufacturers in the Industry would be invited to join the Glass Research Association. Substantial promises had already been received, and it was felt that the scheme would be a great success, especially as it was being looked upon with such favour by the Department of Scientific and Industrial Research. Mr. A. P. M. FLEMING, O.B.E., Director of Education and Research for the British Westinghouse Co., gave a most interesting and instructive account of Industrial Research in the United States. Sir FRANK HEATH, Secretary of the Government Department of Scientific and Industrial Research, then addressed the meeting. He pointed out the glass industry had been engaging the anxious consideration of the Government as much, if not more, than any industry in the country since the war began. During the war the Department had been enabled to help the Industry in many ways, and would do so in the future. There was considerable research still to be carried out, but this would cost money, and take time. He could not help feeling that too much dependence upon state aid indicated necessary for any industry to look outside itself for direct an unhealthy condition in industry. It ought not to be and immediate aid in the conduct of its work. That was not the past of British Industry, which was where it is by its own efforts, a fact we were very proud of. It was certain that British Industry would have to save itself by organisation, and work from within. There was very great call from other industries besides that of glass for knowledge, and he appealed to the Research Association State Aid in Research. Research was insurance for to get the best men possible for their work, and then they would be absolutely certain of good results. Dr. W. E. S. TURNER addressed the meeting. He emphasised the need for research, and showed how it would advantage small firms as well as the great. He gave several examples where money had been wasted and was being wasted for lack of scientific knowledge and supervision. The chemist in co-operation with the engineer was a safeguard in the industry, and he appealed for researches in glass on the pure side as well as the applied. CHEMICAL NEWS, May 2, 1919 Notes from Foreign Sources Before the meeting the Department of Glass Technology was thrown open to members of the Society, many interesting and instructive operations being carried out. Mr. J. B. Davidson, M.Sc., F.I.C., showed the casting of a 2 cwt. Glass Pot. After the visit of inspection, members of the Society had the valuable opportunity of seeing the Vacuum Casting of a large Glass Pot. The pot when finished was some 38" in diameter, and of the hooded variety. The demonstration was carried out by Mr. B. J. Allen. In the evening the Society held their first annual dinner in the Grand Hotel; the chief guest was the past President, Mr. W. F. J. Wood, C.B.E., B.Sc. The other guests present included Dr. Ripper (Vice-Chancellor of Sheffield University), Sir Frank Heath, Dr. F. E. Bradley, Mr. A. P. Trotter, Mr. W. Gibbons, Mr. P. V. B. Tippetts, Mr. A. P. M. Fleming, Mr. T. Mortimer Sparks (Commercial Editor of the Sheffield Daily Telegraph), Mr. R. Ainger (Commercial Editor of the Sheffield Independent). The next meeting of the Society will be held in London on May 21, when it is hoped that Dr. Walter Rosenhain, F.R.S., will read a paper on "Refractories Research carried out at the National Physical Laboratory. On the morning of the meeting members will be given the opportunity to visit the National Physical Laboratory. NOTES. OSMOTIC PRESSURE and PREPARED FOODS.-In keeping preserved foods enclosed in skin, osmotic pressure on the membrane of even slightly salt solutions will tend to prevention of putrefaction. An attending phenomena that such is the case is that during sudden fall of temperature there is a distinct exudation of water.-J. C. THOMLINSON, B.Sc. OSMOSIS AND EMULSIONS.-Osmotic pressure in the presence of emulsions in organic semi-solutions and in pastes gives rise to phenomena, two of which may be described. In the first, solutions of a colloidal character evaporated in vacuo may, after standing for some time, contract to a considerable extent, in which neither contraction on cooling or normal evaporation can be advanced as the immediate causes. In the second, organic pastes contained in membranes, on cooling the external surroundings, transfuse water by osmosis in quantity, the liquid exuded bearing a considerable ratio to the paste left.-J. C. THOMLINSON, B.Sc. A NEW Association called the Technical Inspection Association has recently been formed, which should appeal very strongly to many technical men throughout the Empire who are in any way interested in inspection work. It is the outcome of the Ministry of Munitions Inspection Department, and has been formed for two main purposes:-(1). To maintain intercourse and promote mutual assistance among its members. (2). To conserve and co-ordinate for the national use the experience brought together by the War and generally to develop the progress and standardisation of inspection in the engineering, chemical, and allied industries. Owing to the stoppage of war work the services of large numbers of men, most of whom possess high technical qualifications, and who have spent several years on the inspection of Government contracts, are now available. A list of such members is held the honorary secretaries, who will be glad to supply particulars to any who may be interested. THE Hardware and Engineering Supplies Co., Ltd., 16, Water Lane, Great Tower Street, E.C. 3, are manu. facturing amber glues in liquid and jelly form, as used by ply wood manufacturers, aircraft and cabinet manufac turers, box makers, and bookbinders, superstarch for launderers in liquid form, and soft soaps and soap bases, and desire publícations bearing on these industries. 215 FREDERICK COPE, Consulting Engineer, Southgate Chambers, Wakefield, desires information ee the most efficient plant and up-to-date methods in connection with brickmaking. Also the most modern process for rag carbonising. THE Board of Trade announce that the Fuel Order, 1918, which controls the sale of wood for fuel, will cease to have effect as from April 30. It is notified that Messrs. F. Bunn, King's Lynn, G. V. Sedgwick, Middlesex, and B. C. Wilkinson, Reigate, nominated under the 8th Section of the Weights and Measures Act, 1904, have passed the examination provided for under that Section." A CONSIDERABLE number of merchants and business representatives who formerly lived in Russia are at the present time in the United Kingdom owing to the actions of the Bolsheviks. As a considerable part of the former Russian Empire is now available for trade, it may be that firms in this country would be glad to take advantage of the present exceptional opportunity of obtaining the services of these men, who are especially well qualified to open up trade with Russia. The Department of Overseas Trade would be glad to hear from any firm that desires to be brought into touch with the persons referred to, either immediately or later on, when trading in a more general way can be conducted with Russia. Enquiries should be addressed to the Russian and Scandinavian Section, Sunderland House, Curzon Street, Mayfair, W. 1. AMONGST the questions which the closing months of the war have brought to everyone's notice there is none of wider interest than domestic service. For although it is the custom to joke over "the servant problem," it comes home vividly to every man and woman in the kingdom. Scoffers may laugh at including elementary science in a cook's training, but how else is she to understand and remember why cold water removes the smell of onions while hot water fixes it; why certain foods should be put down in boiling water while others need cold water; why the contents of some saucepans are to be kept covered and others not? In every department of work the more thoroughly you understand the reason for your routine actions the more interesting they become. For that reason it is always well, where possible, to follow up orders with a brief reason for them-it also fixes the order in the maid's memory and prevents her thinking in some cases that it is purely arbitrary, if it seems at first sight slightly more troublesome than her old method. NOTES FROM FOREIGN SOURCES. Yellow Cuprous Oxide.-L. Moser. The best way to prepare yellow cuprous oxide is by the reduction of Cu" ions in presence of OH' ions by means of hydroxylamine hydrochloride, and the electrolytic method, using a pure copper anode and alkali sulphate as electrolyte. The light yellow product which is first precipitated is very probably cuprous hydroxide, which spontaneously gives up water at a low temperature and is converted into the reddish yellow hydrated cuprous oxide which is amorphous. The dry yellow cuprous oxide is quite stable in air, but it shows a tendency to pass very slowly into the crystalline form. This very slow process can be hastened by heating the amorphous product in absence of air. The yellow cuprous oxide must thus be regarded as the primary metastable form which shows a tendency to pass into the metastable red crystalline modification.-Zeit. Anorg. Chemie, 1919, cv., 112. A very Sensitive Reaction of Copper. Application to the Analysis of Ash and Arable Soils.-L. Maquenne and E. Demoussy.-When a hydrochloric acid solution of an ash, sufficiently concentrated and carefully freed from iron and manganese, is treated with potassium ferrocyanide, ordinarily the liquid assumes a yellowish pink tint, indicating the presence of copper. But in most cases the coloration is not stable; it rapidly fades, giving place to a turbidity which on standing or centrifugation is resolved into a blackish precipitate tinged with brown or blue, as if the solution still contained iron. The cause of this anomaly appears to be the presence of zinc which is known to accompany copper in the organs of plants. If ferrocyanide is added to a very dilute cupric solution acidified with hydrochloric acid and containing varying proportions of zinc sulphate, the phenomenon can be reproduced, and when the amount of zinc is double that of the copper a blue mass can be separated by centrifuga. tion. The blue coloration attains its maximum of intenalty and purity when the zinc is four or five times as abundant as the copper, becoming paler as the proportion is increased. This is one of the most sensitive reactions of copper, and it is only necessary for the solution to be free from nitric acid and iron. To apply the method in practice the ash is heated with sulphuric acid in a quartz capsule, the particles of silica and calcium sulphate are separated by centrifugation and the liquid is electrolysed. After twelve hours the cathode is washed with warm nitric acid and water, the liquid is evaporated, the residue calcined and taken up with hydrochloric acid. Then sulphate of zinc (0.25 mg., .., 2 drops of a solution containing 1104 grms. per cent) and a drop of 10 per cent potassium ferrocyanide are added. If copper is abundant, in which case it would have been visible on the cathode at the end of the electrolysis, a pink coloration, which soon turns blue, appears. If the amount of copper is less than oor mg. the blue coloration appears after some minutes and the depth of the coloration of the precipitate obtained by centrifugation gives an indication of the amount of copper present.-Comptes Rendus, 1919, clxviii., 489. I litre; 300 cc. are then evaporated in a platinum crucible with excess of sulphuric acid till white fumes are evolved. The mass is then taken up with water and precipitated with ammonia. If iron is present in considerable amount the precipitate is dissolved in acetic acid, and the iron is removed by 8-nitroso-naphthol. The filtered liquid is then reprecipitated with boiling ammonia, and the new precipitate, which consists of glucina, a little alumina and silica, is washed, dried, and weighed and then treated with a few drops of hydrofluoric and silicic acids to drive off the silica. After evaporation the alumina is removed by fusing the residue with three times its weight of sodium carbonate, extracting the sodium aluminate with water, and finally weighing the insoluble residue of glucina.— Comptes Rendus, 1919, clxviii., 610. Reagent for and Method of Determining Ozone. Louis Benoist.-As the phenomenon of fluorescence can be detected optically with great accuracy the author suggests a method of determining ozone based upon its action on fluorescine. If some cubic centimetres of a very dilute solution of fluorescine are introduced into a flask of slightly ozonised oxygen, after a few seconds the fluorescence absolutely disappears and the reagent is decolorised. If the solution is more concentrated the fluorescence disappears, but the colour of the reagent is only reduced to pale yellow. Pure oxygen has no effect. The traces of nitrous fumes contained in the air have no effect upon this new reagent, but chlorine does decompose fluorescine. On the other hand, its presence is very easily detected by other means and the gas can then be eliminated. The same applies to carbon dioxide, which destroys fluorescence when concentrated. The reaction appears to take place between two molecules of ozone and one molecule of fluorescine, the ratio of the weights being 96 0'29. The least weight of ozone detectable by this method would thus be one third of the least weight of fluorescine which would give an appreciable fluorescence. A Nernst or other lamp giving a very white light is enclosed in a dark box having two contiguous openings in the lid, in which are two colourless glass tubes; one contains the solution of fluorescine and the other control tube contains distilled water only. The caustic by refrac tion is observed in each tube, the one containing fluorescine exhibiting a distinct fluorescence. This method of determining ozone is very sensitive and possesses the advantage of requiring only one solution. The product of the reaction appears to be easily destroyed by heat, but the original fluorescine is not reformed; the addition of ammonia does not cause the reappearance of the fluorescence, and the final weight of the product after drying is only a very little less than that of the original substance. The product without being explosive appears to be in some way related to the ozonides.-Comptes Rendus, 1919, clxviii., 612. 332 Method of Treating Beryl for the Extraction of Glucina.-H. Copaux.-Beryl usually possesses a composition very close to that corresponding to the formula Al2O3.6SiO3.3 BeO, i.e., 67 per cent of silica, 19 per cent of alumina, and 14 per cent of glucina. It is very refractory towards acids, but is acted upon by caustic alkalis, which at a temperature of about 400° transform it into a silico-aluminate of glucina and alkali, which is then readily attacked by acids. This method of opening up the mineral has the disadvantage of necessitating the elimination of the 67 per cent of silica which is present in the gelatinous form. The author has discovered a method of treatment of beryl which depends upon the action of sodium fluosilicate at a temperature of about 850°. Sodium fluosilicate Na2SiF6 is a white crystalline powder which is decomposed by heat at about 750° giving sodium fluoride and silicon fluoride, a very active gas which attacks the glucina giving glucinum fluoride 2BeO+SiF, SiO2+2BeF2. The latter then forms sodium Aluoglucinate with the sodium Aluoride 2BeFa+4NaF-2BeF,Na2, which is soluble in water. The alumina by an analogous reaction is transformed into sodium fuo-aluminate, which is hardly soluble in water. Thus when the product of the reaction is taken up with Το boiling water all the glucina goes into solution. purify the product the aqueous solution is treated with a small excess of boiling caustic soda, which precipitates simultaneously glucina, alumina, and silica, carrying analysis of citrate of lime. (Reply to A. C.). down fluorine. The precipitate is redissolved in sulphuric acid, concentrated to expel the fluorine, and then the glucina is crystallised as sulphate BeSO4+4.0, which is not isomorphie with either aluminium or ferrie sulphate, which may be present in small quantities. By this method about nine-tenths of the glucina in the mineral is recovered. To determine the glucina in beryl 5 grms. of the finely powdered mineral are mixed with 20 grms. of sodium Auosilicate and heated for thirty to forty minutes to 850° in a graphite crucible. After cooling the powdered mass is taken up three times with boiling water and the aqueous liquid after filtration is made up to NOTES AND QUERIES. Our Notes and Queries column was opened for the purpose of giving and obtaining information likely to be of use to our readers generally. We cannot undertake to let this column be the means of transmitting merely private information, or such trade notices as should legitimately come in the advertisement columns. Particulars and references are desired of the Ogston method for the MEETINGS FOR THE WEEK. "Chinese Turkistan-Past and Present," by Sir George Macartney, K.C.I.E. of Industry," by Prof. H. S. Foxwell. Established (WITH WHICH IS INCORPORATED THE "CHEMICAL GAZETTE "). in the Year 1859. Published Weekly. Annual Subscription, free by post. 1. Entered at the New York Post Office as Second Class Mail Matter. Transmissible through the Post-United Kingdom, at Newspaper rate; Canada and Newfoundland, at Magazine rate. Friday, May 9, 1919. PAGE A Registered as PRICE 4d. a Newspaper. POST FREE 44d. ssistant Chemist (22), Higher Certificate In- Assayer, aged about 25, with knowledge of Gold and Silver Assaying, required at once. Permanent position; good prospects; Birmingham. State age, experience, and salary required.-Address, "A. 25," CHEMICAL NEWS Office, 16, Newcastle Street, Farringdon Street, London, E.C. 4. Chemist desires Employment in London. CAPPER PASS & SON, Lim., years Organic Research Work. Would be content to start as Assistant BEDMINSTER SMELTING WORKS BRISTOL, During War, Chief Chemist in a Canadian T.N.T. plant. Two any branch of Chemistry.-Address, S. L., CHEMICAL NEWS Office, 16, Newcastle Street, Farringdon Street, London, E.C.4. Chemist, with four years' training at Finsbury Technical College, having taken active service immediately upon completion of course, is now demobilised and seeks Engagement. -Address, A. E. G., 21, Chestnut Road, West Norwood, S.E. Demobilised Soldier (21), Inter. B.Sc. (Lond.), two years' experience as Laboratory Demonstrator at a Secondary School, desires Position in Works Laboratory, preferably in Midlands or London district.-Address, A. E. B., 13, Midland Road, Rushden, Northants. Metallurgical Chemist (33) desires change. Non-ferrous Analysis, Physical Testing, and Microscopy. Sixteen years' experience, partly in Public Analyst's Laboratory and partly in Metal Refine y-Address, " M 33," CHEMICAL NEWS Office, 16, Newcastle Street, Farringdon Street, London, E.C. 4 PUPIL ASSISTANT-A London Public Analyst, with a large and varied practice, has a vacancy for a Two Analytic Laboratory T. TYRER & CO., Ltd, Stirling Chemical Works, STRATFORD, LONDON, E. on a MANUFACTURING SCALE. CHEMICAL APPARATUS Pure Chemicals for Research Work. JOHN J. CRIFFIN & SONS, LTD., KINGSWAY, LONDON, W.C |