Charles Bland Rndcliffe, M.D. 

 George Rolleston, M.D. 

 Edward Romilly, Esq. 

 Henry E. Roscoe, Esq. 

 "William Henry Leighton Russell, 



Esq. 

 Samuel James Augustus Salter, 



Esq. 



Charles William Siemens, Esq. 

 Maxwell Simpson, M.B. 



[March 6, 



Balfour Stewart, Esq. 

 Thomas Tate, Esq. 

 Thomas Pridgin Teale, Esq. 

 Sir James Emerson Tennent. 

 Isaac Todhunter, Esq. 

 Charles Tomlinson, Esq. 

 C. Greville Williams, Esq. 

 Charles Wye Williams, Esq. 

 Frederick Marow Eardley Wil- 

 mot, Lieut.-Col. R.A. 



The following communications were read : 



I. f *Notes of Researches on the Poly-Ammonias." No. XX. 

 On the Colouring Matters produced from Aniline. By 

 A. W. HOFMANN, Ph.D., LL.D., F.R.S. &c. Received 

 February 20, 1862. 



In a note on the Action of Tetrachloride of Carbon on Aniline 

 submitted to the Royal Society on the 17th of June, 1858, I have 

 described a crystalline basic derivative of aniline formed by the 

 coalescence of three molecules of ammonia, viz. carbotriphenyltri- 

 amine, 



C ]9 H 17 N 3 =(C 6 H 5 ) 3 N 3 , 



the formation of which is accompanied by that of a colouring matter 

 of a magnificent crimson colour. 



It may be useful to quote here the passage * of the paper referred 

 to, in which the formation of the colouring matter is mentioned. 

 "On submitting a mixture of 3^ parts by weight of aniline and 

 1 part of bichloride of carbon, both in the anhydrous state, for 

 about thirty hours to a temperature of 170 C., the liquid will be 

 found to be converted into a black mass, either soft and viscid, or 

 hard and brittle, according to time and temperature. 



" This black mass, which adheres firmly to the tubes in which the 

 reaction has been accomplished, is a mixture of several bodies. On 

 * Proceedings of the Royal Society, vol. ix. p. 284. 



