Du Mez—The Galenical Oleoresins. 1099 
evaporated solvent (probably alcohol). The results obtained 
in the determinations made in the laboratory are given in the 
tables which follow: 
Table 95 —Refractive index of the oleoresin prepared in the 
laboratory. 
Sample 
No. 
Date 
Observer 
Solvent 
Refractive 
index 
At 25° C 
1 
1916 
DuMez. 
Acetone. 
1.5163 
Table 96 —Refractive indices of commercial oleoresins. 
Sample 
No. 
Date 
Observer 
Source 
/ 
Refractive 
index 
1 
1916 
DuMez. 
Lilly & Co. 
At 25° C 
1.496 
2 
Sharp & Dohme. 
1.519 
Chemical Properties. 
Loss in weight on heating: A loss in weight of 9.59 to 15.63 
per cent, was observed for the laboratory preparations when 
heated at 110° C. Except in the case of the oleoresin which 
contained unevaporated solvent (alcohol), the loss did not ex¬ 
ceed 10.32 per cent. Results of a similar magnitude were ob¬ 
tained for the commercial samples examined as is shown in the 
tables which follow. 
Table 97 —Laboratory preparations—loss in weight on heating. 
Sample 
No. 
Date 
Observer 
Solvent 
Per cent, of 
of loss on 
heating 
1. 
1916 
DuMez. 
Alcohol. 
At 110° C 
15.631 
9.59 
2___ 
Acetone. 
3. 
•* 
Ether... 
10.32 
10.08 
4. 
“ 
Benzin.. 
1 Contained unevaporated solvent. 
