Physics and Chemistry. 113 
This receiver is immersed in a freezing mixture. No disengage- 
ment of oxygen takes place, silver phosphate and chlorid be- 
ing the only secondary products. The reactions are as follows :— 
Pe 
Saeed, 9) ,+ (PO) C= ag, Lo, + (NO,C)),. 
oS 
NO NO, 
ee Lot (NO,)Ol= x6? 71 © 4 AgCL 
— Comptes Rendus, \xix, 1142. - 
Lis ee a new method Jor preparing oe acid, —Cuaw 
ating: near othe bottom. a ans of a ak or oil-bath, the pa- 
raffin is kept ata temperature of 180° C, and by a saline bath the 
bromine is maintained at 65°C, As the bromine gradually distils 
over into the parafiin, xe bromhydrie acid gas is evolved, and af- 
to be saturated with it, placed in a vessel surrounded with ice. 
BP, aqueous solution thus obtained saturated at 0° C. has a density 
1:78, and corresponds to the formula HBr, H,0. Each ¢. c. 
Cones ‘46 grms. HBr.— Bull. Soc. Ch., TI, xiii, 197, gaat ee 
G. 
12. On the recovery o Uranium from the Phosphate. ae wile 
a solution of uranium determining volumetrically phosphoric 
acid, residues of uranium nt ace are obtained, from which it is 
desirable to recover the uranium. Two methods for doing this 
have been lately proposed. The first ee HeErntz, obtains the ura- 
nium as nitrate. The phosphate, eee washed, dried and 
weighed, is dissolved in nitric acid. i 
weighed out, and nine-tenths of it added to the nitric solution, 
repeated. All the phosphoric acid is contained in the pre- 
cipitate The filtrate is diluted, treated with sulphydric gas to 
precipitate the last traces of tin, again filtered, cia oe to 
Sat ngapnpaay 
acid by adding sodium acetate, and after considerable dilution, 
peeing to boiling. All the phosphoric acid, together with the 
s of iron, is thus precipitated. Instead of boiling the solu- 
aD a ahiet the addition of the ferric chilorid, it may be treated with 
Am. Jour. Sci.—Szconp Serizs, Vou. L, No. iscdotk. 
8 
