140 Scientific Intelligence. 
K,PtCy,+(TI,CO,), =TI,PtCy,, Tl,CO,+K,CO,. — 
Treated with warm nitric acid, it effervesces, leaving 4 pe 
residue of thallous platino-cyanide. It is nearly insoluble in ve : 
water, and dissolves with difficulty in hot. It may be rece 
ized from a hot solution of thallous carbonate. Its aqueous “ 
tion is colorless, and yields no absorption bands to spectrom 
examination. The crystals are cubes, sometimes so united toge 
as to produce needles. hone 
Thallous platino-cyanide—obtained by decomposing’ hes hite 
platino-cyanide with thallous sulphate—occurs in yo 
crystals, entirely destitute of any dichroic properties.—J. Ch. : ’ 
ix, 461, July, 1871. 6 x 
n Aurine.—Daxx and ScHorLEMMER have made an examill 
tion of commercial aurine—obtained by the action of cone pe 
sulphurie acid and oxalic acid upon phenol. They find tha 
ceeded in separating from it the pure coloring matter. Bhi 
crystallized from hot acetic. acid —its best solvent—it 1s pe it 
either in the form of splendid chrome-red needles, with an a ~ in 
tine luster, having the composition C,,H,,0g, H,0)2 ?, ri the 
smaller dark-red needles having a steel-blue reflexion, wit 160° 
iti O,, 23(H,0). Both lose their water at 1005 
the formula C,,H,, ~ ure aurine heated with ee 
yields benzol and other bodies having a higher poms 
=. Ch, Soe., Il, ix, 466, July, 1871. Ber. Berl. — nas 
574, 
“so acid Of 
of about 150 grams of camphor in two liters of nitric we 
Specific gravity 1-27 (two volumes commercial acid dilute 
on 
. 
s . ous 
ume water) is heated on the water-bath in a capact 
ecke k, until 
co im a with 
: the flask by a plaster of paris luting. 4 in 50 
the above quantity of materials, the process is terminate ee 
by Slides for the microscope, prepared with this substance in the same 
Salicin, are magnificent objects with polarized light.—G. F. B.] 
