VARIATIONS IN THE ACIDITV OF THE URINE. 245 
The first observations were made on ordinary mixed 
food. They form two sets of four and seven days re- 
spectively, and there are added some odd days, which 
could not be united together to form a distinct set. 
Effect of Mixed Diet. 
The first set embraces four days, on which hourly ob- 
servations were made from seven a.m, to eight a.m. next 
morning (except of course the hours of sleep, which form 
a single observation), a period of twenty-five hours. 
