Chemistry and Physics. : 869 
Thus we have for the phonphorts and corresponding arsenic series 
the following formulas 
0H 0H 
Orthophosphorie acid, P@ 4 OH, Orthoarsenic acid, AsO 4 OH, 
0H 0H 
€H, €H 
Methyl-phosphinic acid, PO OH” geet ape getee. eH, 
oH’ thylic acid, 0H 
if €H ; €H 
Ge A aed PO €H.,, Kakodylic acid, As €H,, 
0H 6H 
Teimethylphosphin oO cH, spies panies as ei. 
€H, oxide 
— Berichte der Deutschen chem. Gesellschaft, Jahrgang Vv, P. 104. 
n the compounds of Tungsten.—Roscox has sdticuunional 
the jean of an elaborate and most successful study of the com- 
eo = tungsten with chlorine and bromine. The author began 
W,. 
=i to be igo Pexaehlotiae of tungsten is Poker by 
bt Bg slowl ea attacked by cold water; but if traces of the oxy- 
= , are present, it is immediately dec omposed into 
Cl 5) ee free 
By reducing ‘he. fa rucbloride in a current of Diy ole and 
repeatedly distilling the product in the same gas, lo ng black, 
brilliant needles of pure pentachloride, WCl,, are obtained, which, 
wh bed to powder, have a dark green color like that of 
tassic manganate. The crystals are very hygrosco get — “ne 
at 248° C., solidify at 242°C., and boil at 275°°6 C. 
With water it yields the blue se ts W.9,, ee hlorhydic acid 
Tetrachloride of tun n, - 
brown, crystalline powder when thethesachlorie, or a mixture of 
hexachloride and pentachloride, is distill vee peapelees es ge 
Au. J ete Series, Vor. III, No. 17. nit 1872. 
