1024 Wisconsin Academy of Sciences , Arts, and Letters. 
extract obtained and the oleoresin are not identical, the latter 
consisting only of the oily, liquid portion of the former. Thus, 
it will be observed, upon examining the tables which follow, that 
the total amount of extract obtained with acetone may amount 
to 25 per cent, of the drug operated upon, whereas, the yield 
of oleoresin is only about 18 per cent. The factor which ap¬ 
pears to influence the yield to the greatest extent is the tem¬ 
perature at which the preparation is completed. This is due 
to the fact that the oleoresin is saturated with solid fats 
(principally palmitin) and, that these will be precipitated to 
a greater or lesser degree depending on the temperature at 
which the preparation is finally strained. The finished pro¬ 
duct will, therefore, contain a relatively small amount of these 
fats, and the yield will be correspondingly low when made dur¬ 
ing the cold winter months, whereas, the opposite will be the 
case when the oleoresin is prepared in the hot months of sum¬ 
mer. The following tables show the yield of oleoresin, as re¬ 
ported in the literature, likewise, that obtained in the labora¬ 
tory: 
