186 The Philippine Journal of Science 1922 
and digested 85 per cent of the casein of milk in thirty minutes 
when examined by Pratt in 1914. The dry material had been 
sealed up in small sample vials of glass and had lain in a pigeon- 
Per cent protein digested. 
60 30 40. 50 60 
w+ttsb til g 
LY 
| 
: ry 
UL ty 
iL et 7 | 
: ape 2 | 
ALL AZ 
Cubic centimeters 0.5 per cent papain solution. 
Fig. 1. Curves showing results of experiments with papain solution. 
