64 Royal Society : — 



nics (Stereatics and Hydratics) and Molecular Mechanics (Phy- 

 sics and Chemics). 



35. As to Analy tidal Investigations on the basis of these 

 principles, there does not seem to be any peculiar difficulty 

 raised when any separate order of molecules is considered. But 

 that there will be found great analytical difficulty in passing 

 from a higher to a lower order of molecules, and in expressing 

 the correlations of their motions, is not to be concealed. And 

 that little help is to be found in existing analytical investigations, 

 except, perhaps, those relative to the conduction of heat in cry- 

 stalline media, is not to be wondered at, seeing how recent is the 

 conception of the Correlation of Forces. 



6 Stone Buildings, Lincoln's Inn, 

 25th June, 1861. 



XI. Proceedings of Learned Societies. 



ROYAL SOCIETY. 

 [Continued from vol. xxi. p. 536.] 



November 22, 1860. — Major-General Sabine, R.A., Treasurer and 

 Vice-President, in the Chair. 



THE following communications were read : — 

 " On Boric Ethide." By Edward Frankland, Ph.D., F.R.S., 

 and B. Duppa, Esq. Received July 7, 1860. 



When zincethyle in excess is brought into contact with tribasic 

 / fC 4 H 5 2 x 

 boracic ether, I B< C 4 H 5 2 ) , the temperature of the mixture gra- 

 dually rises for about half an hour. If it be now submitted to 

 distillation, it begins to boil at 94° C, and between this temperature 

 and 140° a considerable quantity of a colourless liquid distils over. 

 The distillation then suddenly stops, the thermometer rises rapidly, 

 and, to avoid secondary products of decomposition, the operation 

 should now be interrupted. The materials remaining in the retort 

 solidify, on cooling, into a mass of large crystals, which are a com- 

 pound of ethylate of zinc with zincethyle. On rectification, the distil- 

 late began to boil at 70°, but the thermometer rapidly rose to 95°, at 

 which temperature the last two-thirds of the liquid passed over and 

 were received apart. The product thus collected exhibited a con- 

 stant boiling-point on redistillation. Submitted to analysis, it yielded 

 results agreeing with the formula 



fC 4 H 6 



b<;c 4 h 6 



IAH 5 



This body, for which we propose the name boric ethide, is pro- 

 duced by the following reaction : — 



