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Abstracts of the Proceedings of the Chemical Society, Vol. 4, No. 57 |
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Proceedings of the Chemical Society, London,
Volume 4,
Issue 57,
1888,
Page 87-98
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ABSTRACTS OF THE PROCEEDINGS OF THE CHEMICAL SOCIETY. -No. 57. Session 1888-89. Titles of Papers received and printed in Transactions during the recess. 53. “The Vapaur-density of Hydrofluoric Acid.” By T. E. Thorpe, F.R.S., and F. J. Hambly. (Preliminary Notice.) 60. ‘(Thiophoephoryl Fluoride.” By T. E. Thorpe, F.R.S., and J W. Rodger. (Preliminary Notice.) 61. ‘‘ The Action of Bromine on Potassium Ferricyanide.” ByEdgar J. Reynolds. 62. ‘‘Some Amines and Amides derived from the Nitranilines.” By Raphael Meldola, F.R.S., and E. H. R. Salmon. 63. ‘‘The Rotatory Power of Benzene-derivatives.” By J. Lew-kowitsch, Ph.D. 64. ‘‘The Action of Chromium Oxychloride on Ortho-substituted Toluenes.” By Charles M. Stuart, M.A., and W. J. Elliott. 65.‘‘ The Molecular Weight of Iodine in its Solutions.” By Morris Loeb, Ph.D. 66. “The Use of Aniline as an Absorbent of Cyanogen in Gas Analysis.” By Morris Loeb, Ph.D. 67. ‘‘Two new Chlorides of Indium, and on the Vapour-densities of Indium, Gallium, Iron and Chromium Chlorides.” By L. F. Nilson and Otto Pettersson. 68. “Some Derivatives of Anthraquinone,” By A. G. Perkin, and W. H. Perkin, Jun., Ph.D. 88 69. The Influence of Silicon on the Properties of Iron and Steel.” Part 11. By Thomas Turner, Assoc. R.S.M., F.I.C. 70. ‘‘ The Isonitrile of Phenylhydrazine.” By S. Ruhemann, Ph. D., and W. J. Elliott. 71. “ Researches on Silicon Compounds and their Derivatives. Part 111. The Action of Silicon Tetrabromide on Allyl- and Phenyl- thiocarbamides.Part IV. The Action of Ethyl Alcohol on the Com- pound (H4NzCS)8SiBra.’7 By J. Emerson Reynolds, M.D., F.R.S. November lst, 1888. Mr. W. Crookes, F.R.S., President, in the Chair. Messrs. James Schleselman and Henry A. Miers were formally admitted Fellows of the Society. Certitkates were read for the first time in favour of Messrs. Charles M. Adams, 29, Mosley Street, Newcastle-on-Tyne ; John Hope Belcher, B.A., Craigmount, Edinbnrgh ; Percy Carter Bell, The Cliff, Higher Broughton, Manchester ; William Berry, Hampton Park, Redland, Bristol ; William D. Bohm, 51, The Avenue, Acton ; Frank Bower, 37, Lansdowne Road, Clapham Road, S.W.; James E. Brunker, Minore, Saint Kevin’s Park, Rathmines, Dublin ; George Alexander Byrn, Technical College, Sydney ; John Morrow Campbell, 22, Regent Moray Street, Glasgow; Vaughan Cornish, B.Sc., High School, Newcastle-under-Lyme, Staffs. ; William Douglas, A.I.C., Diamond, Demerara ; Arthur G.Everard, North Street, Bishop’s Stortford, Herts ; Henry Forth, 1, Beech Avenue, Sherwood Rise, Nottingharn ; Frederick B. Guthrie, 65, Portland Road, Notting Hill, W. ; John Lawrence Van Guyzel, Indian Medical Service, Madras ; John Hansfield, Waterfoot, near Manchester ; Urban Arthur Jackson, 2, New Bridge Street, Strangeways, Manchester ; Alfred Battye Knaggs, Ebor Mount, Huddersfield ; Oscar Lowman, B.A., Ph.D., 66, West 8th Street, Cincinnati, Ohio ; William Marshall, The Baths, Saint Andrews, N.B.; George Edward Perry, 6, Norwood Villas, Edgbaston, Birmingham ; Hubert Naylor Bardsley Richardson, Elmfield, Knighton, Leicester ; John S.Rigby, Bagot Street, Liverpool ; John Sanderson, 5’7, Belsize Park Gardens, London, N.W.; Thomas Oliver Landolt, Baron’s Court Road, West Ken- sington ; William Jay Schieffelin, Areis Strasse, 1, Munich; Arthur Landaner Stern, Bass & Co’s. Old Brewery, Burton-on-Trent ; William Taylor, Hong Kong ; Charles Turner, 25, Sidney Street, Cambridge ; J. T. Ainslie Walker, Hope Cottage, Winch- burgh, Linlithgowshire ; Edward Dalrmyple Walrond, B.A., North Eastern County School, Barnard Castle, Durham ; Frederick Walmesley Warrick, 13G, Southampton Row, W.C. ; Edward J. Way, Transvaal Gold Exploration Company, Transvaal ; Ernest William Whieldon, 42, Worthingham €toad, East Dulwich; R.W. Woosnam, York House, Southend-on-Sea. The following papers were read :-72. “The Constitution of the Terpenes and of Benzene.” ByWilliam A. Tilden, D.Sc., F.R.S. With the object of testing further the current hypothesis concerning the constitution of the terpenes, the author has made a series of quantitative estimations of the amount of paratoluic acid produced by the oxidation of several of the terpenes with dilube nitric acid in comparison with the amount of ths same product formed under the mme condition from cymene and from paraxylene. The following results were obtained :-100 parts by weight give of paratoluic acid- Cymene (from turpentine) ...................80.1 Cymene (from cumin oil) .................... 73.1 Paraxylene (Kahlbaum’s) .................... 77.2 Australene from American turpentine. ......... 1.2 Terebenthene from French turpentine. ......... 1.9 Hesperidene from orange oil.. ................ 0.0 Dipentene from C,H,,-SHCl obtained from terpin 27.6 An experiment on a larger scale with hesperidene showed that the chief product of its oxidation by nitric acid is oxalic acid: using chromic acid mixture, Wright and Beckett found that acetic acid was the only product. The characteristic properties of the terpenes as a class,-the readi-ness with which they polymerise by heat or contact with a small quantity of sulphuric acid, the eagerness with which they combine with bromine, with hydracids, and in some cases with the elements of water, and the nature of their products of oxidation,-are such that they differ wholly from all known benzenoid hydrocarbons.In order to settle the limit of the combining capacity of the chief terpenes about which there is some difference of statement on the part of different authors, the amount of bromine taken up by the hydrocarbon was determined. From the several experiments made in each case the following numbers were deduced. 90 136 parts or 1 mol. proportion of the hydrocarbon combines with the following quantities of bromine :-Australene ................................. 313 Terebenthene .............................. 307 Hesperidene ................................322 Dipentene (terpilene) ........................ 297 Calculated for Br, 160; for 2Br2 320. In all cases the hydrocarbon unites with 4atoms of bromine and no more. Camphene does not combine with bromine and hence must be regarded as saturated in the usual sense. Since the terpenes possess at most four units of available combining capacity, the nucleus of 6 carbon-atoms, which they all undoubiedly contain, cannot be supposed to form an open chain. They must be united into a closed chain containing at the most two double bonds. ,Hence formulae of the character of those proposed originally by Oppenheim, and later by Goldschmidt and Zurrer, by Wallach and Briihl are the most probable. Such formulae represent the molecule as constructed upon the basis of a ring of 6 carbon-atoms disposed in the manner which has been so long familiar in Kekul6’s formula for benzene. But since the terpenes are certainly not benzene-derivatives, ICekulB’s formula must be abandoned.The evidence in support of this conclusion is not derived solely from the foregoing considerations ; which standing alone would probably be regarded as inconclusive. The chief objection which has been urged against KekulB’s formula is based upon the difference in the nature of the link between the carbons which stand in the relative positions 1 : 2 and 1 : 6. The hypothesis devised by Kekul6 himself to meet this difficulty cannot be regarded as satisfactory. Another objection to the symbol is that benzene is represented as containing “ethylenic ” carbon, for which there is no evidence at all ; moreover a body of this formula when treated with nitric acid ought to yield abundance of oxalic acid : this the terpenes do, but the benzenoid hydrocarbons do not.The characteristics of the benzenoid hydrocarbons and their derivatives may be explained by the formulae proposed by Claus, by Ladenburg, and by Armstrong and von Baeyer, but at present there is not sufficient evidence to enable us to decide between them. As to the terpenes, the conclusions derived from their refraction equivalents are so much at variance with the chemical behaviour of many members of the group, that they cannot be accepted without considerable qualification. Such other physical evidence as is deducible from the work of Hartley, and of Abney and Festing, tells entirely against the assumption that the terpenes are derivatives of benzene.91 DISCUSSION. Referring to Professor Tilden’s statement that it was anobjection to KekulB’s formula that benzene did not yield oxalic acid on oxidation, Dr. JAPPsaid that, phenol, he believed, gave a considerable quantity of the acid on oxidation with alkaline permanganate. Mr. GROVESadded that) oxalic acid was obtained in quantity on oxidation of chloranilic acid ; and Dr. PERKINremarked that he had obtained a quantity of oxalic acid in preparing picyic acid from phenol. Dr. PEREINsaid that the magnetic rotatory power of American turpentine was remarkably low, which was a probable indication of the non-existence of a Cs nucleus.Dr. ARMSTRONG expressed the opinion that the evidence at disposal was entirely insufficient to enable us to determine the constitution of the terpenes with any degree of probability. He could not accept Dr. Tilden’s conclusion that camphene was saturated, as it readily united with a molecular proportion of hydrogen chloride. With regard to t,he constitution of benzene, his main contention was that the cross connexion of carbon-atoms exhibited in Clam’s and similar formulae was inconceivable ; he believed that corresponding carbon- atoms could exercise an influence upon each other although uncon- nected except indirectly. Professor TILDENsaid that his chief object in referring to the con- stitution of benzene was to emphasise his opinion that whatever the nature of the combination between the carbon-atoms, it did not correspond to that which obtained in ethylene.73. “Some new compounds of Magnesia with the Halogens: a contribution to the study of the electrolysis of Magnesium Chloride solutiop.” By C. F. Cross and E. J. Bevan. Their observations on the electrolysis of magnesium chloride in aqueous solution, which is now a process of preparing bleaching solutions on the large scale, had previously made the authors aware tha,t the decomposition was attended by interactions not to be ex-plained on the view commonly held, viz., that the ions are magnesium and chlorine, which by secondary interactions give rise to magnesia and hypochlorous acid.With the view of elucidating the actual mechanism of the electro- lysis the authors have studied in the first instance the phenomena at the cathode. The white substance separated under the condition that the solution is not kept in circulation, is riot magnesia (hydrate), but a chloroxygen-compound of magnesium, in which the ratio of C1 to total oxidising power expressed as C1 is approximately 1 : 2. It may be regarded, therefore, as a magnesium hppochlorite. It is worthy of note that the percentage weight of “total oxidising C1” lies between 30 and 35,calculated on the anhydrous substance. The compounds described were analysed in the freshly prepared and hydrated condi- tion. They differ from the normal magnesium hypochlorite not only in being insoluble, but also in point of their stability. Similar compounds were obtained on electrolysing solutions of magnesium bromide and magnesium iodide, though in the case of the latter the ratio-Total oxidising iodine : Iodine as silver iodine-is considerably less than 2, viz., approximately 6 :5.Nevertheless, the compound decomposes ammonia with evolution of nitrogen, and is in all its properties rather a compound than a mixture of iodine with magnesia. The authors are engaged in studying the phenomena to be observed at the anode during the electrolysis in question, and the composition of the resulting solution in regard to the whole of the chloroxygen- compounds, of which there appear to be at least two.74. “ The Heat of Dissolution of various substances in different liquids.” By S. U. Pickering. The author has explained the constancy of the heat of neutraliaa-tion of acids by alkalis on the view that the affinity of the radicles composing the salt molecules concerned is not entirely saturated by their combination, and that the residual affinity of one of these radicles becomes in each case entirely saturated by the solvent. The heat of combination of the atoms, and the heat of dissolution of the molecules which they form, are thus parts of the same operation, and must, therefore, both be chemical in their nature. Dr. Nicol has sug- gested the possibility of the heat of dissolution of the molecules of four solids showing the relation expressed by MRlaq -M’Rlaq = IMRflaq -M’R’laq, which would render the above-mentioned con-nexion between the heat of dissolution and formation of the molecules unnecessary. The author shows that if Dr.Nicol’s suggestion held good a certain relationship would obtain between the heat of dissolu-tion of two pairs of salts in two different liquids. To investigate this he has determined the heat of dissolution of the nitrates and chlorides of calcium and lithium in water and in alcohol, and has found that they give results showing a difference of 4461 cal. where, aacording to Dr. Nicol’s view, there should be no differenceat all. Other salts were also examined and it was found that the he$ of dissolution in alcohol was sometimes greater and sometimes less than in water. 93 According to the aut'hor's views the heat of dissolution should be t,he same whatever the solvent were, provided (1)that the residual affinity of one only of the radicles constituting the dissolved sub-stance be saturated by the solvent, and (2) that the saturation be effected by free affinity of the solvent, i.e., that, no alteration in the force with which the molecules or atoms of the solvent are united together be involved.The fiwt condition is ensured by taking an elementary substance instead of a salt ; and the author has found that the heats of dissolution of iodine and bromine in various liquids give much more nearly identical results than salts do, and that with liquids containing no oxygen the results ai-e identical within experi- mental error.Oxygenated liquids give higher results, and the presence of sulphur as a constituent element of the solvent has, to a certain extent, the same effect as oxygen. If the second as well as the first above-mentioned conditions could be secured, the results would probably be in all cases identical ? DISCUSSION. Professor RAMSAYsaid it appeared that the heats of dissolution of iodine in various media might be arranged in two well-defined groups. Might not this be correlated with the fact that iodine dissolves in certtain liquids forming a brown solution and in others forming a violet solution ; and with the observation recently made by Loeb that iodine existed in these differently coloured solutions in different moleculax states. 75." The Criteria of Plane and Axial Symmetry." By Henry E. Arms trong . Wislicenus, in his now widely known paper on the space arrange- ment of the atoms in carbon-compounds, has termed compounds of the a.C.7, a.C.h form 11 axially symnzetric, and those of the form 11, pZarzeb.C.a a.6.b symmetric. In aliocating these formulae, he has argued, in a case such as is afforded by the two tolane dichlorides, for example, that the compound of higher melting point (143") is necessarily the plane symmetric modification, as it is produced on chlorinating tolane : and he urges that this conclusion derives support from the behaviour of tolane tetrachloride on reduction. Of the three possible configura- fions which this compound may acquire, viz.:- c.C,H, c1 c1 c. C6H5 c1 c1 c CGH, cz CI c.c1 c,'E-T5c1 c.c1 c1 C6H5 C C,H, C1 C1 ; he regards the first and second as far the most likely to exist, especially at low temperatures ; both would furnish, on withdrawal of two corresponding chlorine-atoms, the same axially symmetric tolane dichloride, and it is therefore to be supposed that t)he modification formed in larger quantity on reducing the tetrachloride would be this modification. According to t,he recent experiments of Blank (Annulen, 248, l),the two isomeric dichlorides are obtained nearly in the pro- portion of two parts of that of lower melting point (63") to one of that of higher melting point ; and the axially symmetric structure is therefore, it would seem, as a matter of course, assigned by him to the compound of lower melting point.The first argument is only valid provided that at the moment of change no isomeric change supervenes, and must be accepted with reserve-if not regarded as altogether untrustworthy-as further study of the changes involved in the production of isomeric com- pounds appears to make it more and more probable that the final product is very frequently the product of an unperceived isomeric change (cf. these Proceedings, 1887, Abstr. Nos. 99-101 ;1888, Abstr. Nos. 50, 51). The second is not an argument based on clearly ascertained facts, but derives its force eutirely from hypothetical views as to the reIative affinities of the radicles present, in a compound, and the effect on the ultimate configuration which these affinities would have, and is especially based on the conventional assumption that dissimilar radicles would terd to influence and attract each other more than would similar radicles.But it is to be remembered that we have little certain knowledge of the relative affinities of different radicles, especially of similar as compared with those of dissimilar mdicles; indeed, that our views are not based on the stndy of ths radicles themselves, but are mere inferences from the apparent behaviour of the radicles in their compounds. Moreover Thomsen's observations on the heats of combustion of chlorine compounds may be held to some extent to favour a view contrary to that put, forward by Wislicenus (cf.PhiZ. Mug., 1887 [5], 23, 106). The most important argument averse to the interpretation given by Wislicenus, however, is to be found in the fact that in cases in which the constitution may fairly be regarded as established, the relation between configuration and physical properties is of the obverse order to that indicated by Wislicenus. Thus, in the case of benzene di-derivatives, the symmetric 01' para-derivative has always the highest melting point ; the same appears to be true of the symmetric tri- and tetra-derivatives ; and in the case of naphthalene, in a series 95 of isomeric di-derivatives, the axially symmetric modification is always that of highest melting, point, thus- c1 c1 c1 /\/\ iyi0"' \A/c1 M.p. 107'. M. p. 83". M. p. 68". M. p. 135'. M. p. 114". Again, of the four known iiaphthaleiiedisulphonic chlorides, the axially symmetric da4' modification melts at 183",t,he dissymmet,ric gp modification at 128", the axially symruet,ric /3'/3'' modification at 226",and the plane symmetric p'/"' modification at 160". Employing the argument from analogy, it is therefore probable that the tolane dichloride melting at 143" is the axially symmetric, and that melting at 63" the plane symmetric modification, and also, for example, that elaidic acid-and not oleic acid as Wislicenus assumes -has the "axial" structure. In the case of maleic and fumaric acids the argument here relied on would support the conclusion already arrived at by Van't Hoff and accepted by Wislicenus, which, however, is based not on geometric considerations, but on the observed property of maleic acid to form an anhydride.It is a noteworthy fact that the majority of "alloisomerides "-to use a term which is sufficiently expressive while it does not beg the question as to the determining cause of the isomerism-are com-pounds containing unsaturated carbon, usually in association with one of the halogens or oxygen. It does not appear that this circum- stance has yet been taken into account, or that the extent to which the peculiarities manifested by the negative elements are concerned in and may condition the isomerism has been in the least considered. The symbolic system introduced by Van't Hoff and adopted by Wislicenus tends to withdraw attention from the consideration of the possible effect of the peculiarities referred to, inasmuch as a "double bond" is represented as the precise equivalent of two, and a treble bond as that of three single bonds ; which all observations show is a misrepresentation of the facts.76. "Derivatives of Methylindole." By H. G. Colman, Ph.D., B.Sc. By the action of sodium hypobromite solution on methylindole or 96 nietlzyliudolecarboxylic acid, Fischer and Kess (Ber., 22, 561) obtained a brominated compound which, on treatment with alkali, yielded methylpseudisatin. It is shown that the brorninated substance is dibromomethyl-oxindole, a white crystalline substance melting with decomposition at 204".If sodium hypochlorite be substituted for sodium hypobromite, the corresponding dichloromethyloxindole is obtained, m. p. 145-147". Both compounds on boiling with alkali, or better with water, yield methylpseudisatin. The phenylhydrazone and oxime of the latter have been prepared : they are yellow, crystalline compounds melting at 145-146" and 180-183" respectively. By the reduction of dibromethylosindole in acid solution, mono-bromomethyloxindole and methyloxindole are successively obtained. Both are white, crystalline compounds, the former melting at 132-134", and the latter at 86-88'. Methylpseudisatin, on reduction in acid or alkaline solution, yields methyldioxindole ; this crystallises from benzene in needles or prisms melting at 149-151 O.77. '' Acetamide and Phenanthraquinone." By Arthur T. Mason, Ph.D., F.I.C. The author finds that when oximide is heated in sealed tubes with glacial acetic acid at 220-230" C., acetamide is formed, which, however, on recrystallisation from ether or benzene, totally loses the peculiar smell of mice excrement which has hitherto been supposed to be its principal characteristic. Ordinary acetamide, prepared by the distillation of ammonium acetate, also becomes odourless by twice rectifying and rejecting the first portions of the distillate. Acetamide, when heated with phenanthraquinone in sealed tubes at 220-230" C., using glacial acetic acid as solvent, yields diphen- anthrapiazine, an indifferent body, having a melting point over 400" C.and belonging to the "azine " group. 78. " The Action of Ethylenediamine on Succinic Acid." By Arthur T. Mason, Ph.D., P.I.C. The addition compound, C2H4(COOH)z*C2H4(NH2)2,is first pro- duced ; it crystallises in thick, white prisms melting at 181-182" ; if it be heated above this temperature, it parts with water, ethyl-enedisuccinimide, CHz*Co>N-CH,-CHz*N<:::gz,being formed CHz*CO which melts at 250-251", and distils undecomposed at 395". This compound gives the pyrrole reaction on distillation with zinc-dust 97 containing hydroxide. It is not attacked by bromine and water at 120c, but at 180" ethylenediamine bromhydride is formed. Ethylene disuccinamic acid, COOH*C,H~*CO*NH*C~H~*NH~CO*C2H4~GOOH,is prepared from the diimide by boiling with baryta-water; the acid crystallises from water in large, colourless, quadratic plates melting at 184-185'; its silver salt is anhydrous; the calcium salt has the formula CloHlaN20sCa+ 3H20.ADDITIONS TO THE LIBRARY. I.Donatiofis. Geological and Natural History Survey of Canada. Annual Report. New Series. Vol. 11. 1886. Montreal 1881. From the Survey. Verhandlungen der Kaiserlichen Leopoldinisch-Carolinischen Deutschen Akademie der Naturforscher. Bande 49-51. Halle 1887. From the Academy. Proceedings and Transactions of the Royal Society of Canada for 1887. Vol. V. Montreal 1888. From the Society, An Introduction to the Study of Meteorites. By L. Fletcher. London 1888.From the Trustees of the British Museurn. Army Medical Department. Report for the Year 1886. London 1888. From the War Office. Royal College of Surgeons, Ireland. The Carmichael Prize for 1887, " The Medical Profession in the Three Kingdoms in 1887," by T. Laffan. Dublin 1888. From the Council of the College. Collection des anciens alchimistes grecs, par M. Berthelot ef C. E. Ruelle. Seconde livraison comprenant les omvres de Zosime ; texte grec ef traduction frangaise. Second Livraison. Paris 1888. From the Authors. Laboratory Manual of General Chemistry, by R. P. Williams. Boston 1888. From Messrs. Triibner. Manganese Steel, by R. A. Hadfield. London 1888. From the Author. Smithsonian Miscellaneous Collections. Vols. 33 and 33.Wash-ington 1888. From the Smithsonian Institution. The Life of Sir William Siemens, by W. Pole. London 1888. Prom the Executors. '11.By Purchase. Universal -Pharmakopoe ; eine vergleichende Zusammenstellung 98 der zur Zeit in Eusopa und Nordamerika gultigen Pharmakopoen, von B. Hirsch. Zweite Auflage, Erster Band. Gottingen 1888. Unfersuchungen aus der Praxis der Garungsindnstrie, von E. C. Hansen. Heft I. Munchen und Leipzig 1888. L’Art de l’Essayeur, par A. Riche, avec la collaboration de E. G&. Paris 1888. Die Anilinfarben und ihre Fabrikation, von K. Heumann. Erster Theil, Triphenylmethan-Farbstoffe. Braunschweig 1888. Analyse chimiques des substances commerciales minerales et organiques, par R. Jagnaux. Paris 2888.Recherches sur les eaux minerales des PyrBnBes, par E. Filhol: Paris 1888. Fortschritte der Theerfarbenfabrikation und verwandter Indnstrie- zweige 1877-1887. an der Hand der Dentschen Reichs-Patente dargestellt, von P. Friedlander. Berlin 1888. Recherches sup les modifications de l’atmosph&re, par J. A. De 3;uc. 2 tomes, 4to. Genhve 1772. Meletemata Philosophica, Adriani Heerebord. 4to. Lugduni-batavorum 1659. Johannis Beguini Tyrocynium Chimicum, edente Gerardo Blasio. Amstelodami 1669. De Coloribus Libellus a Sirnone Portio. 4to. Florentiae 1548. Onomnstikon, seu Lexicon Medicinae Simplicis Othonis Brunfelsii (small folio) 1543. Ordo Institutionurn Physicarum, T. Rutherforth. &to. Canta-brigiae 1743. Jacobi Bruckeri Institutiones Historiae Philosophicae. Lipsiae 1756. At the next meeting on November 15th, there will be a ballot for the election of Fellows, and the following papers will be read :-“The principles of Thermocheniistry.” By S. U. Pickering. “Note on the mixture of Propyl alcohol and water.” By Pro- fessors Ramsay and Young. ‘‘Note on the action of Nitric acid on Ammonium chloride.” ByDr. Matthews. “ Ethylic cinnamyldiethacetate.” By the same. “ Piazine-derivatives.” By Dr. Mason. HARRISON AND SONS, PRINTERS IN ORDINARY TO HER MAJESTY, ST. MARTIN’S LANE
ISSN:0369-8718
DOI:10.1039/PL8880400087
出版商:RSC
年代:1888
数据来源: RSC
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