Chemistry and Physics. 147 



2. On Hyporanadic Oxide and its Compounds.— Crow has 



tetroxide) and some of its comnoui being deter- 



mined analytically either by titrition with permanganate or by 

 fusing and weighing as pentoxide. Hypovanadic oxide. p.v, ,a ivd 

 by heating the chloride to redness in an atmosphere of rarhon 



It is a 'dark-. nMe in water, sohibfe 



in acids or "alkalies, and absorbs oxvgen from the air. The 

 hydrate, obtained l.v precipitating a solution of the sulphate or 

 chloride with sodium carbonate,' filtering in an atmosphere of 



water, both po* 



ders. Two similar .'r-., raine.l. The chloride, 



V 2 4 C1,, (H.O)„ prepared by dissolving the pentoxide in 



id I I <n_U • sulphide. 



: -■ . • . ' • 



sl.aned crystals, when the sulphate or chloride is treated with ex- 

 cess of potassium hydrate and allowed to stand, closely stoppered, 

 some hours. The sodium salt is sin >'■", barium, 



lead and >iher salts, the last two of which are anhydrous, are also 

 described as brown or black precipitates.—,/ Chem. Xoc, xxx, 

 453, Nov., 1876. G. r. b. 



by Liin^. an ■ ■ nd'a view that they are paired 



S^^valent'^^ 



H— O— NO=:=NO-— <K 



>Pt, 

 H — O NO=:=NO — 0-" 



being called platotetrauitrosylic acid or platonitrosylic acid, and 

 ■:,■» compounds contain- 

 which, to the four mtrosj 

 there are two piatinun is and -n more atom of oxygen. 



This radical h Itrosyl, the free acid, 



H— O NO=:=NO O PK. 



H— O— NO=:=NO 0~- IV' 



being diplatonitrosylic acid and the salts diplatonitrites. Xi— n 



■ . ., , .■■■■■::...,:....:. 



magnesium. as, ferrous, cupnc, zinc, 



