1032 Wisconsin Academy of Sciences , Arts, and Letters. 
Table 34 — Specific gravities of commercial oleoresins. 
Sample 
No. 
Date 
Observer 
Source 
Specific 
gravity 
1.. 
1.916 
DuMez... 
Squibb & Sons.. 
At 25° C 
0.910 1 
0.919 
0.928 
2. 
Lilly & Co. 
3. 
“ 
Sharp & Dohme. 
1 o ntained ether 
Refractive index: Determinations made in the laboratory 
show that the oleoresin should have a refractive index of about 
1.47 when observed at 25 °C. A refractive index lower than 
this was found to be due to the presence of unevaporated solvent. 
The solvent employed in extracting the drug or the variation 
in solid fat content appears to have very little influence, if 
any, on this constant. The results obtained in the laboratory 
in the examination of the oleoresin follow: 
Table 35 - Refractive indices of oleoresins prepared in the laboratory. 
Sample 
No. 
Date 
Ob»erver 
Solvent 
Refractive 
index 
1 .. 
1910 
DuMez & Netzel. 
Alcohol. 
At 25° C 
1.46S 
1.477 
1.474 
1.475 
1.473 
1.473 
1.474 
1.472 
2 . 
Acetone. 
3. 
“ 
44 
Ether. 
4.. 
“ 
Petrol, ether. 
1. 
1916 
DuMez. 
Alcohol . 
2 . 
Acetone. . 
3 . 
“ 
•• 
Ether ....... 
4 . 
•* 
4 . 
Petrol, ether . 
Table 36. — Refractive indices of commercial oleoresins. 
Sample 
No. 
Date 
Observer 
Source 
Refractive 
index 
1 . 
1916 
DuMez . 
Lilly & Co.... 
At 25° C 
1.472 
1.473 
1.467* 
2 ........ 
Sharp & Dohme. 
3. 
44 
Squibb & Sons. 
1 Contained ether. 
