Du Mez—The Galenical Oleoresins. 
983 
Table 10.—Continued. 
Date 
1999 
1911 
1913 
914 
Observer 
VanderkleedO) 
Vanderkleed 
Rosendahl... 
Harrison&Self 
Riedel. 
Vanderkleed 
Yield of oleoresin to 
Perct. 
Perct. Perct. 
10.00 
12.50 
11.50 
9.50 
11.60 
8.80 
7.90 
8.80 
7.70 
9.70 
8.60 
7.50 
7.00 
10.90 
9.40 to 
9.70 
o “ 
Per ct. 
\Solvent ? 
< 6.85 to 
( 10.12 
Remarks 
Reported as yield of oleo¬ 
resin. 
Rhizomes harvested in 
May. 
Rhizomes harvested in 
August. 
Rhizomes harvested in 
October. 
Rhizomes from “Harz.” 
‘Bay< 
( “ Schwarz- 
-n wald, Wuert- 
( emberg.” 
I “Mosel, 
< Rhein- 
( Preussen.” 
Average yield of oleoresin 
is reported as 8.23 per cent. 
1 The high yield (1.79 per cent.) obtained in this instance is suggestive of 
the use of acetone as the menstruum for exhausting the drug. It may, how¬ 
ever, have been due to the extensive adulteration of the latter with the 
rhizomes of Dryopteris spinulosa. Rosendahl (1911) obtained 17.0 per cent, 
of oleoresin from the rhizomes of this species by extraction with ether. 
Table 11 .—Yield of oleoresin obtained in the laboratory. 
Yield of oleoresin to 
Date 
Observer 
Alco¬ 
hol 
Ace¬ 
tone 
Ether 
Benzin 
Remarks 
1909 
DuMez & Baker. 
Per ct. 
Per ct. 
18.27 
Per ct. 
9.3 
Per ct. 
Represents the yield 
using aSoxhlet’s ex¬ 
traction apparatus. 
“ 
DuMez & Beedle.... 
9.7 
Represents the yield 
using a Soxhlet’s ex¬ 
traction apparatus. 
1910 
DuMez & Netzel. 
43.38 0) 
16.10 
8.70 
7.5 
Represents the yield 
using a Soxhlet’s ex¬ 
traction apparatus. 
0) The alcoholic extract was obtained by simple percolation. 
