20 



The Philippine Journal of Science 



lUlS 



although any further increase up to 0.20 per cent causes practi- 

 cally no change. A sharply defined range of acidity thus reduces 

 the digestion to one-half its former value. One more example 



Per cent protein dixeistcd. 



/c 



20 



30 



40 



50 



\ 

 1 

 i 2. 



/. 











1 



1 







































\ 











\ 





k 









\ 



\ 



\ 









\ 





\ 









\ 





\ 





















1 







1 

 _ 1 



0.20 

 Of 3 

 G./6 

 0./4- 



o 0.12 



? 0.10 



0.0 d 



0.06 



0.0^ 



0.02 



Fig. S. Digestion in hyilrochloi-ic acid solution. Curve 1. With •'iO millif^rams of papain. 

 Curve t. With 25 milligrams of papain. 



of digestions under similar conditions, but with a less amount of 

 papain, will serve to show the same peculiar efTect. 



The results are plotted as curve 2 in fig. 3. It will be noticed 

 that the two curves are entirely analogous and that the percent- 



