OF ARTS AND SCIENCES. 133 



0.2018 gram substance dried over H 2 S0 4 in a vacuum gave 0.4515 



gram C0 2 and 0.1061 gram H 2 0. 

 0.1495 gram substance dried over H 2 S0 4 in a vacuum gave 20.8 c.c. 



moist nitrogen at 17° and 748 mm. 



Hydrochloride of Phenylbnidoformylehloride, 2GqK^s=C^ , HC1. 



On passing hydrochloric acid gas, which has been dried by means 

 of phosphorus pentoxide, over phenylisocyanide, cooled to — 15°, so 

 violent a reaction takes place that it is not possible to regulate 

 it, even by diluting the gas with dry carbon dioxide. The ad- 

 dition of hydrogen chloride to the isonitrile can however be ac- 

 complished quantitatively, if the latter be diluted with 6 to 8 

 times its volume of absolute ether, and the dry gas be passed over 

 this solution, cooled to — 15°, until it smells of hydrogen chloride; 

 a white powder separates out, soon after the above operation is 

 begun, and after it is ended the mixture is allowed to stand fifteen 

 minutes. An equal volume of dry ligroine (bpt. 70° -80°) is then 

 added, the white precipitate is washed by decantation, and spread 

 out on porous clay plates, and transferred as quickly as possible to 

 a desiccator. After twelve hours' standing in a vacuum, it was 

 perfectly dry, and gave the following results on analysis : — 



0.2193 gram substance gave 0.2939 gram AgCl (Carius). 

 0.2024 gram substance gave 0.2681 gram AgCl (Carius). 

 0.2875 gram substance gave 22 c.c. moist nitrogen at 20° and 

 750 mm. 



That a salt of the formula 2 C 6 H 5 N=C=, 3 HC1, is formed, is proved 

 with greater precision even than by the analysis by the following 

 experiment. 20 grams phenylisocyanide treated as described with 

 hydrogen chloride, etc., gave 30.8 grams pure dry salt (calculated 

 30.6 grams). The salt thus obtained is a colorless powder, which 

 cannot be kept very long without decomposition; it is very hygro- 



