264 



AMYLOLYTIC POWER AND CHEMICAL 



of the secretion. At the same time it is to be observed that 

 the above differences in composition and amylolytie power are 

 much more marked with the individual R than with A, B, 

 and D. In fact, with the latter three individuals there is very 

 little difference in composition in the saliva before and after 

 the morning meal, and further in the third experiment with 

 R the amylolytie power after the meal is greater than that 

 of the saliva secreted before eating. These results have led 

 to another series of experiments having in view especially the 

 determination of the fluctuations in the character of the saliva 

 throughout the day. 



IV. VARIATIONS IN THE COMPOSITION AND AMYLOLYTIC 

 POWER OP HUMAN SALIVA THROUGHOUT THE DAY. 



In the first series of experiments under this head the saliva 

 studied was collected by chewing a piece of rubber. The 

 midday dinner was omitted; breakfast, however, was taken 

 at 7.50 A. M. and supper at 6.40 P. M. Samples of saliva 



* In this and the two following experiments amylolytic power was deter- 

 mined by Robert's method. 



