418 



INFLUENCE OF ACIDS ON THE 



the other conditions are unchanged, is illustrated. (See Table 

 F, page 419.) 



Third Series The influence of increased quantities of 



neutral starch paste in modifying the inhibitory effect of 

 acid is shown below. 



TABLE G. 

 Period of digestion, 10 minutes. Temperature, 37 C. 



In Table H the effect of acid of varying strength upon the 

 saliva is shown. It was first ascertained that five c.c. of saliva 

 carefully neutralized to litmus required exactly five c.c. T $5 n 

 hydrochloric acid to give the faintest reaction with dimethyl 

 amidoazobenzol. Equal volumes of saliva were then mixed 

 with varying quantities of hydrochloric acid, the total volume 

 in each case being kept the same. At the end of the intervals 

 indicated, the mixtures were carefully neutralized to litmus, 

 and their digestive power tested with starch paste. The 

 results of two experiments are given in Table H. 



TABLE H. 



