48 
ON ALOES AND ALOETINE. 
ART. XIV. — ANALYSIS OF ALOES AND ALOET INE. 
By M. Edmond Robiquet. 
The specimen of the aloes examined, was obtained from M. 
Chevallier; it was found to contain the following constituents 
in 100 parts: 
Pure aloes (Alottine) . . . . 85.00 
Ulmate of potash 2.00 
Sulphate of lime . . • . . 2.00 
Carbonate of potash ... ) 
Carbonate of lime « . > traces. 
Phosphate of lime ) 
Gallic acid . . . . . 0.25 
Albumen ..... 8 
To obtain the alottine or purified aloes, commercial aloes, 
reduced to powder, was exhausted with cold distilled water, 
by which means none of the salts present, excepting the ulmate 
of potash, and a small quantity of sulphate of lime and carbo- 
nate of potash, are taken up. This solution was evaporated 
over a water-bath until reduced to one half, and an excess of 
neutral acetate of lead was then added, which threw down a 
light flocculent yellow precipitate, consisting of a mixture of 
gallate, ulmate, and albuminate of lead, and containing traces 
of carbonate and of sulphate of lead. 
The solution now contained, in addition to the aloes, ace- 
tate of potash, and acetate of lime, resulting from double de- 
composition, and the excess of acetate of lead. On adding 
a sufficient quantity of ammonia, the precipitated oxide of lead 
carried down all the aloes contained in the liquor, forming a 
kind of lake of a pure orange-yellow colour, passing in a few 
minutes under the influence of the solar light, to a greenish- 
yellow. This lake, quickly separated and washed with boil- 
ing water, w T as decomposed by a current of sulphuretted hy- 
drogen, atmospheric air being excluded. On the conclusion of 
