Du Mez—The Galenical Oleoresins. 
1107 
it loses volatile oil upon exposure to the air, and as the glycer¬ 
ides are prone to undergo partial decomposition due to the ac¬ 
tion of the moisture and oxygen. 
Yield. 
The information at hand is not sufficient to permit of a state¬ 
ment being made as to what the average yield of oleoresin 
should be in this case. The results obtained in the laboratory 
and those reported by Beringer show that it is at least 24 per 
cent., when ether or acetone are the solvents employed in ex¬ 
tracting the drug, whereas those reported by Vanderkleed 
would appear to indicate that the yield is much lower. The 
available information of this nature is given in the following 
tables: 
Table 107 —Yield of oleoresin as reported in the literature. 
Yield of Oleoresin to— 
bate 
Observer 
Alco¬ 
hol 
Ace¬ 
tone 
Ether 
Other Solvents 
Remarks 
Per 
cent. 
Per 
cent. 
Per 
cent. 
Per cent. 
1892.. 
Beringer. 
i 
24.0 
Benzin 
19.3 
The total yield of 
extractive mat¬ 
ter to benzin is 
given as 22.3 per 
cent, which in¬ 
cludes 3 percent, 
of deposited wax. 
Reported as yield 
of oleoresin. 
1913, 
Vanderkleed ... 
Solvent (?) 
11.40 
13.04 
14.70 
Table 108 — Yield of oleoresin as obtained in the laboratory. 
Yield of oleoresin to— 
Date 
Observer 
Alco¬ 
hol 
Ace¬ 
tone 
Ether 
Other 
sol¬ 
vents 
Remarks 
1916 
PuMez. 
Per ct. 
Per ct. 
28.89 
Per ct. 
29.17 
Per ct. 
Represents the yield using a 
Soxhlet’s Extraction App, 
