38 
ON QUINOIDINE. 
pure white, yellowish, or yellow like gold. In the latter 
case, part of the colouring matter, might be removed by the 
formation of the neutral sulphate, and by treating it with 
purified animal charcoal. This, however, cannot be done 
without considerable loss. This colouring matter probably 
does not much influence the effect of the preparation. The 
yellow amorphous quinia becomes still brown on the addi- 
tion of concentrated sulphuric acid, and after some time, if 
water be added, som.e brown flakes are precipitated. If 
yellow amorphous quinia be dissolved in muriatic acid, 
and an excess of chloride of platinum added, a pure, double 
quinia salt is formed ; but if the filtrate be mixed with sal 
ammoniac and the solution evaporated in the water-bath to 
dryness, a yellow salt remains as residue, which contains, 
besides the platinum-chloride of ammonium, a golden- 
yellow, not bitter, substance, which is insoluble in ether, 
but is soluble in anhydrous alcohol, and may thus be iso- 
lated. — Pharm. Journ. from Pharm. Central Blatt. 
ART. IX.— ON BLISTERING CLOTH. ^ 
By M. Garoste. 
p. Black pitch, purified, 125 parts, 
White wax, 30 parts, 
Cantharides in fine powder, 60 parts. 
Essence of turpentine, 15 parts, 
Olive oil, 8 parts. 
The pitch is purified by melting it in a dish, and strain 
it through a close piece of linen. 
