202 



370. OXIDE, BISMUTHOUS. Bi 2 3 . (Trioxide of Bismuth.) 



a. Yellow powder. 



371. OXIDE, BISMUTHIC Bi 2 5 . (Pentoxide of Bismuth.) 



a. Reddish powder. 



VANADIUM. V. 



372. VANAPATE OF AMMONIUM. N H 4 V O s . 



f a. White powder. 



COLUMBIUM, OR NIOBIUM. Nb. 



373. OXIDE. Nb 3 5 . (Niobic Acid.) 



t a. White powder. 



HEXAD METALS. 



CHROMIUM. Cr. 



374. METALLIC. 



f a. Small pellets. 

 Note. This specimen was prepared by Professor Redwood. 



375. CHLORIDE. Cr 2 C1 6 . (Chromic Chloride, Trichloride of 



Chromium.) 



a. Violet crystalline laminae. 



Note. This specimen was prepared and presented by Mr. Baldock. 



376. OXIDE. Cr 2 3 . (Chromic Oxide, Sesquioxide of Chromium.) 



* a. Anhydrous, a green crystalline powder. 



b. Ditto, resembling small green tea in appearance. 



c. Hydrated, prepared by precipitation. 



Note. Specimen a was prepared by heating potassic dichromate ; and 

 specimen b by igniting ammonic dichromate. 



377. TRIOXIDE. Cr 3 . (Chromic Acid.) 



a. Crystallized. 



URANIUM. U. 



378. METALLIC. 



f a. Pure. 



379. AMMONIO-CARBONATE. (NH 4 ) 2 , U0 2 , 4C 3 . (Ammonio-uranic 



Carbonate, Carbonate of Uranyl and Ammonium.) 

 a. Yellow crystalline crusts. 



380. NITRATE. U 2 (N 3 ) 2 , 6 H 2 0. 



a. Crystallized. 



381. OXIDE. U 3 . (Uranic Oxide, Uranyl Oxide.) 



a. Reddish yellow powder. 



b. Specimen of glass coloured by uranate of sodium. 



