568 



XV. " Contributions to the History of the Phosphorus Bases." 

 Parts I., II. and III. By A. W. HOFMANN, LL.D., F.R.S. 

 &c. Received June 21, 1860. 



" 



This paper contains the first three sections of the full and syste- 

 matic exposition of the author's Researches on the Phosphorus 

 Bases, of which brief notices have from time to time been communi- 

 cated by him to the Society, and printed in the * Proceedings.' The 

 present communication comprehends 



I. Deportment of Triethylphosphine with Sulphur com- 

 pounds. Nitro-phosphuretted Ureas. 

 II. Theory of Diatomic Bases. Diphosphonium Series. 

 III. Theory of Diatomic Bases. Phosphammonium and 

 Phospharsonium Series. 



COMMUNICATIONS RECEIVED SINCE THE END OF THE SESSION. 



I. "On Boric Ethide." By EDWARD FRANKLAND, Ph.D., 

 F.R.S., and B. DUPPA, Esq. Communicated by Dr. 

 FRANKLAND. Received July 7, 1860. 



When zincethyl in excess is brought into contact with tribasic 



/ fC.H.O.\ 



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

 V tC 4 H 5 2 / 



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 zincethyl. 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- 



