1100 Wisconsin Academy of Sciences , Arts, and Letters. 
Table 98 —Commercial oleoresins—loss in weight on heating. 
Sample 
No. 
Date 
Observer 
Source 
Per cent, 
of loss on 
heating 
1. 
1916 
DuMez. 
Sharp & Dob me. 
At 110 0 C 
7.22 
9.46 
20.68 
2. 
Squibb & Sons. 
3. 
Lilly Co. 
1 Contained ether. 
2 Probably contained unevaporated solvent (alcohol). 
Ash content: The ash contents, in the case of the oleoresins 
prepared in the laboratory, were found to be 0.93, 1.46 and 1.82, 
depending on whether ether, acetone or alcohol was employed 
in their preparation. A somewhat similar variation in the 
amount of ash obtained for the commercial samples examined 
is, therefore, taken to be an indication of the indiscriminate use 
of the above mentioned solvents in their manufacture, instead 
of acetone as was directed to be employed by the 1900 edition 
of the United States Pharmacopoeia. The slightly higher values 
obtained for the commercial samples may have been due to the 
copper, which was found to be present in considerable amounts. 
The results obtained in the ash determinations made in the lab¬ 
oratory follow: 
Table 99 —Ash contents of oleoresins prepared in the laboratory. 
Sample 
No. 
Date 
Observer 
Solvent 
Per cent, 
of ash 
1. 
1916 
DuMez... 
Alcohol. 
1.62 
2. 
Acetone. 
1.46 
3. 
“ 
“ 
Ether... 
0.93 
4. 
“ 
Petrol, ether .. 
0.08 
Table 100 —Ash contents of commercial oleoresins. 
Sample 
No. 
Date 
Ob¬ 
server 
Source 
Per cent, 
of ash 
Foreign con¬ 
stituents 
1916 
DuMez. 
Squibb & Sons. 
0.87 1 
Copper 
2. 
Lilly & Co. 
1.53 9 
3.... 
Sharp & Dohme.... 
1.71 
1 Contained ether. 
2 Probably contained unevaporated solvent (alcohol). 
