Du Mez—The Galenical Oleoresins. 
1131 
Table 129 —Laboratory preparations—loss in weight on heating. 
Sample 
No. 
Date 
Observer 
Solvent 
Per cent, of 
loss on 
heating 
1 ......... 
1016 
DuMez. 
Alcohol. 
At 110° C 
10.34 
11.52 
2 . 
Acetone.. 
3. 
♦ * 
44 
Ether. 
10.91 
9.49 
4 . 
4 4 
Petrol, ether 
Table 130 —Commercial oleoresins—loss in weight on heating. 
Sample 
No. 
Date 
Observer 
Source 
Per cent, of 
loss on 
heating 
1. 
1916 
Du Mez. 
Sharp & Dohme.. 
At 110° C 
17.52 
32.64 1 
2. 
Sduibb & Sons. 
1 Unevaporated solvent (ether) was present. 
Ash content: The ash determinations made on the oleoresins 
prepared in the laboratory show that the solvent employed in 
their preparation is the chief factor influencing the results ob¬ 
tained. The official product, in the making of which ether was 
the solvent used, yielded 0.11 per cent, of ash, which was about 
the percentage yield obtained for one of the commercial samples 
examined. The other commercial oleoresin gave 0.29 per cent, 
of ash indicating the use of acetone in its preparation. Both 
samples contained copper, apparently, however, in quantities 
too small to noticeably affect the weight of the ash. The re¬ 
sults of the determinations made in the laboratory follow: 
Table 131 —Ash contents of oleoresins prepared in the laboratory. 
Sample 
No. 
Date 
Observer 
Solvent 
Per cent of 
ash 
1. 
1916 
DuMez. 
Alcohol... 
0.43 
2.... 
Acetone. 
0.32 
3. 
•* 
•• 
Ether. 
0.11 
4. 
«» 
“ 
Petrol, ether. 
0.05 
