Chemistry and Physics. 103 
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eatin: soda salt is gio having the formula SbF,, NaF. Two 
iné ammonium salts have respectiv 
and 9(SbF.. 2H) 4H © espectively the formulas Sb, NH,F 
| The fluo-arsenates are still more easily soluble than the fluo-antimonates 
| e therefore more difficult to obtain pure. Marignac describes crystal- 
“ salts having respectively the formulas 2(AsF., KF)+H,0; AsOF,, 
5 ; ©; and As, OF,,4KF+3H,6; which last 
7 oo ee 
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| Journal will remove any doubt as to the pentatomic character of the 
- Acti 
tit of the hydracids upon both simple and compound ethers, is pre- 
Sely analogous to that which these acids exert upon the anhydrids, 
im 
piety represent a negative or acid radical, and B a positive or 
toholic one, the formation of a compound ether may be expressed thus: 
AOL lo= 7 e+HC. 
ee for some hours. And in every case the decomposition was foun 
br. inks ace according to the equation given above, methylic or ethylic 
(ey i produced, and the acid of the ether being set fi 
the alcohols, hydrobromic acid acts thus :— 
ft O+HBr= jz} O+BBr, 
