412 Scientific Intelligence. 
quired for every one of the platinic chlorid. If sufficient acid 
be present, the fluid remains clear, even on dilution with water. 
After standing twelve hours in a well closed vessel, the dark 
redness. Heated in a stream of hydrogen, water is given off, an 
17. Potassio-platinie oxysulphoplatinostannate—On fusing t0-— 
gether an intimate mixture of 4 parts stanno-platinous stannate, 6 
r 
there remains a cochineal-red crystalline powder, which may 
obtained pure by washing with water, in which it is insoluble 
Similar crystals 
‘sulphur, or by fusing together 6 parts spongy platinum, 3 
stannic sulphid, 12 parts potassic carbonate, and 12 parts sulphur, 
color, and having an almost metallic luster. Treated with hydro- 
chloric acid, the color of the powder changes to gray, the potas 
