EXAMINATION OP THE STROILES OF THE HOP. 71 
in alcohol and ether ; the alcoholic solution, when it is much 
concentrated, allows a deposition under the form of pearly 
scales ; this solution reddened litmus paper, it precipitates the 
neutral acetate of lead, the nitrate of silver and sulphate of cop- 
per. The solid matter exposed to a temperature of 70° or 75° 
is not liquified, but gives rise to some disengagement of air, 
and is finally rendered slightly brown. 
F. Examination of the liquid product. 
This liquid has a brownish yellow color, a very penetrating 
odor, which resembles that of rancid soap; its taste is sweet in 
the first instance, then a little bitter, and soon produces acrid- 
ity in the throat; an acridity which has some resemblance to 
that produced by the oil of the Croton tiglium; it is soluble in 
alcohol and ether, and reddens litmus paper, previously moist- 
ened with distilled water. Exposed to a temperature a little 
elevated, it becomes volatilized in part, giving off a whitish 
vapour; the part not volatilized becomes slightly brownish and 
thickened ; litmus paper moistened and plunged into the va- 
por undergoes no change. Finally, from the whole of the 
physical properties, this oily matter is similar to the fixed oils: 
it loses its rancid odor by time. It is to this principle that 
the young shoots of the hop owe their light degree of acri- 
dity. 
To judge from the examinations which I made, these two 
last products appear to be acid in their nature. I regret not 
having obtained sufficient of them to study them well. While 
in doubt, I shall content myself with indicating the solid sub- 
stance by the name of resin, and the liquid substance by that 
of oil. 
From what we have just seen, it will be admitted that the 
young shoots of the hop possess the following constituents : 
1st, Albumen, insoluble; 2d, Albumen, soluble ; 3d, Gum, 
or mucilage; 4th, Sugary matter; 5th, Extractive matter; 
6th, Red coloring matter; 7th, Asparamide; 8th, Resinous mat- 
ter; 9th, Oily matter ; 10th, Tannin : 11th, Malic acid ; 12th, 
Malate of lime; 13th, Sulphate of potassa. 
