URINE. 307 



diet, the evidence is not absolutely clear, for it can be seen from table 

 40 that although the men were supposed to be eating in a perfectly 

 normal manner, as a matter of fact they took absolutely the same 

 amount of nitrogen on two of the three days recorded and nearly the 

 same on the third day. Hence, we do not deal here with a true uncon- 

 trolled diet. The data are therefore somewhat defective in indicating 

 the probable normal urinary excretion of the undergraduates of this 

 college. 



Immediately prior to placing Squad B upon restricted diet in 

 January, urine was collected from these men for a period usually varying 

 from 16| to 27 hours, and the nitrogen excretion computed therefrom 

 on the 24-hour basis. These data are given in the lower portion of 

 table 45. The average value for the entire group, calculated on the 

 24-hour basis, was 13.14 grams. The average value for Squad A 

 during the last 2 days in September, was 11.48 grams; for the first 3 

 days in October it was 12.88 grams. (See table 41.) The latter aver- 

 age is practically the same as that found in the fragmentary data 

 with Squad B, i. e., 13.14 grams. 



At the conclusion of our experiment at Springfield it became evident 

 that we should have further data regarding the probable normal 

 urinary excretion. It was observed by all of us that the college men 

 were well fed, apparently enjoyed their meals, had a great deal of physi- 

 cal exercise and were very busy men. In spite of the general tendency 

 towards conservation of wheat products, it appeared not unlikely that 

 these men might normally eat considerable quantities of protein. This 

 was further emphasized to our minds by the fact that on the days of 

 uncontrolled diet practically all of our subjects took rather liberal 

 amounts of protein. Consequently Professor Elmer Berry was suffi- 

 ciently interested to arrange with another group of 12 men, none of 

 whom had served on either squad, for the daily collection of their entire 

 urine for 4 days, i. e., February 11 to 15, inclusive. These urines were 

 sent to the Nutrition Laboratory and there analyzed. The results are 

 given in the upper part of table 45, and show that the average for 

 these 12 men in this time was 13.97 grams, a httle more than that 

 calculated for Squad B and approximately 1 gram more than was 

 found for Squad A during the first 3 days in October. It is some- 

 what questionable, of course, to assume that exactly the same dietetic 

 habits would obtain, so far as protein intake is concerned, in the 

 middle of February as in the first week in October. Nevertheless, it 

 is highly probable that the average nitrogen excretion of these men 

 is not far from 13 grams per day. Consequently we may rightly 

 infer from the examination of the data in table 44 that Squad A, while 

 on the reduced diet, had a nitrogen excretion averaging not far from 

 10.5 to 11 grams, and hence was on a slightly lower nitrogen output 

 per day than was the regular undergraduate body of the Y. M. C. A. 

 College. 



