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Physics and Chemistry. 413 
_ (4) By their union these two compounds may produce a third oxyd 
(of the class of saline oxyds of Dumas) which corresponds to the formula 
WO0,+W0,=2WO,. 
(5.) Tungstic acid is polybasic; its simple or double salts are repre- 
sented by the general formulas 
(WO,),MO, HO+Aq. 
They easily form double salts by uniting, either with each other: 
(WO,),MO, HO 
* (wo')eMo, Ho f TA% 
_ 6, or with simple tungstates, 
(WO,),MO, HO 
wo>Mo,Ho f TAY 
The formulas comprise the paratungstates and certain acid tungstates, 
(8.) Sulphur, chlorine, and bromine combine with tungsten, producing 
compounds which correspond exactly to the oxyds and acids formed with 
oxygen, 
(9.) Tungsten does not produce an oxychlorid any more than phos- 
Phorus. The compounds which have been so designated are combina- 
tions in definite but variable proportions of anhydrous acid Whig ey 
corresponding chlorid.—Ann. der Chimie et de Physique, Jan. 1864, 93. 
Ww. G 
pile & new organic base, to which he has 
te new base is a black glistening erystalline ¢ ; 
specular iron ore. Mauveine dissolves in alcohol, giving a violet solution 
Which oo aed a purple color on the addition of acids, It is a very 
e@ 
8, On Mauve or Anilin purple— PERKIN has discovered in anilin 
strongly it yields a basic oil. The formula of mauveine is C,,H, N 
et m a boiling alcoholic solution in small prisms possessing & 
lant green metallic lustre. Its formula is C,,Ho4 ed 
be fe . 
salt combines with bi i i f beautiful crystalline 
ichlorid of platinum to form a 
haPound, the formula of which is CssHasNa: BO re 
deseri several other crystalline salts, which serve to prove the 
Ww. 
29 Correctness of the formula adopted.— Proc. of the Royal Society, xii, ibs 
