( 256 ) 



3. To what extent does the length of time during which the 



agar columns are on the mucous membrane, influence 



the quantity of enzyme and pro-enzyme absorbed? 



For these experiments the stomach was divided into two symme- 

 trical halves. On one half' two neutral agar-columns were placed at 

 A, B, C etc., and on the corresponding places of' the other half 

 A', B', C" etc. two columns of aikalic agar. One of the two columns 

 near A, near B, near C etc. was taken away and treated, after 

 having been on the mucous membrane for 18 hours; the same was 

 done with those near A', B', C' etc. The other series A, B, Cebc. 

 A', B', C' etc. was left on the membrane for 36 hours. In both 

 series of experiments the thus activated agar was made to act for 

 20 hours on the albumen columns. The tables will be plain now 

 without further explanation. 



TABLE IV. 



Determination of the quantity of pepsin and pepsinogen which had passed into 

 the neutral agar, after the latter had been on the mucous membrane for- 



TABLE V. 



Determination of the quantity of pepsinogen which had passed into the aikalic 

 agar, the latter having been on the mucous membrane during 



18 hours 36 hours 



