228 



Prof. Roscoe on Vanadium. 



[Dec. 19, 



YI. Vanadium Nitrides. 



(1) Vanadium Mononitride, VN = 65-2. — A greyish powder unalter- 

 able in the air, obtained by heating the ammonium oxychloride to white- 

 ness in a current of ammonia. Both vanadium and nitrogen were directly 

 estimated, with the following results : — 



(2) Vanadium Vinitride, yN2 = 79'2. — A black powder obtained by 

 Uhrlaub on heating the ammonium oxychloride to a moderate temperature. 

 The vanadium was estimated by Uhrlaub, but he did not understand the 

 constitution of the substance, as he assumed the atomic weight of the 

 metal to be 68*5, and did not estimate the nitrogen. 



The vanadium nitrides not only demonstrate with absolute certainty the 

 true atomic weight of the metal, but they also serve as the starting-point 

 from which to commence the study of the metal itself, as well as an en- 

 tirely new class of bodies, viz. the compounds of vanadium with chlorine 

 and the other halogens. 



The author hopes to describe these interesting substances in the next 

 communication. 



The Society then adjourned over the Christmas Recess to Thursday, 

 January 9 th. 



Vanadium 

 Nitrogen 



Calculated. 

 /8-6 , 

 21-4 . 



Found. 

 77-8 

 20-2 



