74 PROTEIN DIGESTION IN THE INTESTINE 



all conditions and for the whole period of its life, of main- 

 taining the specificity of its own peculiar proteins can be 

 understood and conceived of, as far as the author is per- 

 sonally concerned, only by adopting the idea that every 

 proteid in the food is probably, before it can be assimilated, 

 broken down into amino acids. This conception must be 

 acknowledged, however, to be purely a personal one, and is 

 offered only as such. In the last count every man can think 

 only with his own brain. 



