254 Scientific Intelligence. 
line powder of density 5:52, which when heated in the air burns 
like tinder and leaves pure spongy platinum. Sodio-platinous sul- 
. re-exa 
of the compound containing tin, platinum, potassium and sulphur, 
described in his previous paper, has led Schneider to the conclusion 
that this body contains no oxygen, and that its true formula is 
K,S§, Pt”S, Pt’S, Pt’S $Sn'*S,, 
in which the quadrivalent platinum is replaced by quadrivalent 
in. In addition to the sodium salt corresponding to the compoun 
last formulated, Schneider describes a disodium salt which has the 
formula Na,S, Na,S, Pt’S, Pts } Pti's,. 
When freshly prepared, this salt forms thin brilliant light copper red 
needles. It rapidly changes color in the air and becomes brown 
and finally almost black. Water dissolves it with partial decom- 
position, leaving a dark red crystalline powder of bisulphid of pla- 
tinum, Schneider obtained by double decomposition silver and 
thallium salts corresponding to the disodium compound.—Pogg. 
. 
nN.. CXXXViii, 604, 
3. Synthesis of 
hydric acid upon ethylic nitrate Losszn obtained the chlorhydrate 
of a new base, NH,®, w ich he termed hydroxylamin. 
re dire 
addition of nascent hydrogen to nitric oxyd, expressing the reaction 
by the equation 6+H,—NH,9, 
which is more correctly written 2N 8+3H,=2NH,9. The nitric 
oxyd was prepared by the action of nitric acid upon ferrous sul- 
phate and collected in a glass gasholder from which it was made 
described by Lossen.— Berichte der Deutschen Chem. Gesellschaft, 
2ter Jahrgang, p. 671. w. G 
4. a new group of double chlorids belonging to the platinum 
et adding solutions of various metallic chlorids strongly 
Reiset’s first base, PtCl, 2NH, or 4NH,, PtCl,, “s 
obtained a series of double chlorids embraced by the general form- 
ula 4NH,, PtCl, ms son has found that a 
. 
solution of a metallic salt as copper. silver, nickel, d&c., to a solution 
of double chlorid of platinum and ammonium, PtCl,, 2NH,Cl. 
salts are talline and vary in color according to the 
wholly different properties is obtained by adding an ammoniacal 
= 
itated from this solu 
4€ In water and insoluble in chlorhydric acid. 
: oe w. G 
