1070 Wisconsin Academy of Sciences, Arts, and Letters. 
The yield of oleoresin is further influenced by the degree to 
which the rhizomes have been deprived of the outer corky layer, 
and, in the case of bleaching, to the manner in which the latter 
was accomplished. With respect to this statement, the yield, 
in the case of the unbleached ginger, will be the greatest when 
decortication is complete. When the rhizomes have been 
bleached, in addition to being partially or wholly decorticated, 
the influence of the latter, may be diminished, in part at least, 
by the process employed in accomplishing the former. Thus, if 
gypsum or lime have been used for this purpose, the weight of 
the insoluble material in the rhizomes will be considerably in¬ 
creased, which will have the effect of reducing the percentage 
yield of oleoresin. These points are also brought out in the 
tables which follow. 
