1034 Wisconsin Academy of Sciences , Arts, and Letters. 
indicate the use of different solvents in their preparation. The 
comparatively high value (0.40 per cent.) obtained in one case, 
however, may have been due to the copper present. The ash 
content of the samples examined in the laboratory is given in 
the tables which follow: 
Table 39 — Ash contents of oleorsins prepared in the laboratory. 
Sample 
No. 
Date 
Observer 
Solvent 
Per cent, 
of ash 
1. 
1916 
DuMez..... 
Alcohol........ 
0.39 
0.26 
0.09 
0.09 
0.39 
0.24 
0.12 
0.10 
2.. 
Acetone... 
a. 
Ether. 
4 . 
5 . 
Petrol, ether... 
Alcohol... 
6 . 
Acetone. 
7. 
Ether .. 
8 ... 
Benzin.. 
Tabe 40.— Ash contents of commercial oleoresins 
Sample 
No. 
Date 
Observer 
Source 
Per cent, of 
ash 
Foreign 
constituents 
1 . 
1916 
DuMez . 
Sauibb & Sons. 
0.09 1 
0.40 
0.30 
Copper 
2. 
Sharp & Dohme 
3 . 
4 . 
Lilly & Co. 
1 Contained ether. 
Acid number: The acid numbers, when acetone, ether, or 
petroleum ether were used in the preparation of the oleoresin, 
were found to be 106.6, 103.8 and 105 respectively. When 
alcohol was employed for this purpose, the value obtained for 
this constant was considerably lower, being 93.5. With respect 
to the commercial samples examined, the acid number was in 
all cases found to be much lower. This is thought to be due, 
in two instances, to a low free acid content (principally pal¬ 
mitic acid) of the drug from which the oleoresins were pre¬ 
pared, or to the more complete removal of these acids in the 
separation of the deposited material. In the third case, it 
was caused, in part, at least, by the presence of unevaporated 
solvent. The acid numbers obtained for the preparations ex¬ 
amined in the laboratory are as ofllows: 
