ON QUINOIDINE. 
49 
essential oils or spirits, would in general act rather as an 
irritant and rubefacient upon the skin in such cases, than as 
a purifying, cleansing, and soothing application. In this 
dilemma, the idea occurred of incorporating the green rock- 
oil with fine curd soap. Thus a truly balsamic compound 
has been obtained. When the soap, used with water in 
the usual way, has cleared out the cutaneous pores, a film 
of the petroleum is deposited in them, powerfully remedial 
in many of the morbid affections of the skin. Such petro- 
lized soap has been found to be quite a specific in the 
prickly heat of tropical regions, and of equal efficacy in the 
fiery eruptions incident to many persons in temperate 
climates. Hitherto, no method had been devised for molli- 
fying efficaciously the alkalinity of soap, which being, as 
in the best white curd article, a definite saline compound of 
stearic acid, and soda in its most caustic condition to the 
extent of six per cent., cannot fail to excoriate delicate 
skins. By the present happy invention, each particle of 
that salt is enveloped with a film of balsam, which miti- 
gates its irritant, without interfering with its detergent 
quality. Hence we may account for the preference given 
to the petroline soap by all who habitually use it at the 
toilet-table. — Pharm. Journ. 
ART. XI. — ON QUINOIDINE. 
By F. Roder. 
The author has, in consequence of the results published by 
Liebig on the constitution of quinoidine, made some experi- 
ments to obtain from quinoidine or amorphous quinine the 
latter in a crystalline state. 1 part of commercial quinoidine 
is dissolved in 4 parts alcohol of 0-865, and a solution of $ 
a part protochloride of tin in 2 parts of water added to it. 
