CHARACTER OF KATABOLISM 
99 
cycle riding, and with some of the subjects the inability to urinate at the proper 
time made a sharply cut separation practically impossible. It was hoped 
that the collection of the urine could be divided into two periods, the first 
beginning when the subject rose in the morning and ending when the work 
experiment began, and the second covering the period of work. This separa- 
tion was obtained in only two experiments, those of November 21 with 
H. L. H. and of March 27 with M. A. M. On the other hand, with M. A. M. 
specimens of urine were obtained at some time during practically every day 
of work, and determinations made of the total nitrogen. The results of 
these determinations are given in table 100, which shows that the nitrogen 
excretion per hour ranges from 0.06 to 0.77 gram, averaging not far from 0.4 
gram per hour. Since the body-weight of this subject was approximately 
65 kilograms, it can be seen that under the conditions of the experiments, 
which were usually part resting and part severe muscular work, the nitrogen 
excretion per kilogram of body-weight per minute was approximately 6 
milligrams per hour per kilogram of body-weight. This is, if anything, 
Table 100. — Nitrogen in urine during experiments without food, with rest and muscular work 
Nitrogen 
Total 
excretion. 
Subject. 
Date. 
Period of collection. 
Duration of work during 
period. 
volume 
of 
urine. 
Total 
Per 
amount. 
hour. 
1911. 
e.c. 
gms. 
gms. 
H. L. H. 
Nov. 21 
6>>50" 
9 5-5 
a.m. tc 
a.m. 
9*55" 
2 05 
a.m. 
p.m. 1 
Before work 
450 
198 
1.47 
1.14 
0.48 
.27 
10>> 20* a.m. to 11>> 25"" a.m. 
J. E. F. 
Nov. 22 
8 40 
a.m. 
12 15 
p.m. 
10 40 a.m. 11 02 a-m. 
130 
1.69 
.47 
E.P. C. 
Nov. 23 
1912. 
6 30 
a.m. 
12 30 
p.m. 
10 17 a.m. 11 03 a-ni. 
116 
1.79 
.30 
M. A. If. 
Jan. 15 
Jan. 17 
Jan. 18 
6* 45 m a.m. tc 
6 30 a.m. 
6 00 a.m. 
9* 26" 
9 15 
10 20 
a.m. 
a-m. 
a.m. 
Before work 
295 
303 
100 
1.26 
1.09 
1.33 
.47 
.40 
.31 
Do 
9*20™ a.m. to lO* 25™a.m. 
Jan. 19 
Jan. 24 
Jan. 25 
6 30 
6 00 
6 00 
a.m. 
a.m. 
a.m. 
9 50 
9 30 
11 10 
a.m. 
a. in. 
a.m. 
Before work 
106 
182 
155 
1.72 
0.95 
1.44 
.52 
.27 
.28 
Do 
9>> 47™ a-m. to ll fc 01™ a.m. 
Jan. 26 
5 30 
a.m. 
12 00 
noon 
9 23 a.m. 10 35 a.m. 
112 
1.61 
.25 
Jan. 31 
7 00 
a.m. 
12 30 
p.m. 
9 48 a.m. 11 12 a.m. 
215 
2.05 
.37 
Feb. 2 
Feb. 7 
Feb. 8 
6 45 
8 00 
7 00 
a.m. 
a.m. 
a.m. 
9 45 
9 42 
12 00 
a.m. 
a.m. 
noon 
Before work 
173 
220 
26 
2.05 
0.85 
0.32 
.68 
.50 
.06 
Do 
9* 37™ a.m. to 10»> 43™ a.m. 
Feb. 13 
7 30 
a.m. 
12 00 
noon 
9 45 a.m. 11 59 a.m.» 
122 
1.16 
.26 
Feb. 14 
Feb. 15 
7 00 
6 40 
a.m. 
a.m. 
9 40 
12 30 
a.m. 
p.m. 
Before work 
142 
175 
1.20 
1.78 
.45 
.31 
9* 41™ a-m. to lO* 51™ a.m. 
Feb. 16 
7 50 
a.m. 
2 00 
p.m. 
9 50 a.m. 11 00 a.m. 
235 
2.91 
.47 
Mar. 6 
7 30 
a-m. 
11 50 
a.m. 
10 04 a.m. 11 05 a.m. 
238 
1.51 
.35 
Mar. 11 
6 30 
a.m. 
12 15 
p.m. 
10 37 a.m. 12 16 p.m.' 
150 
1.79 
.31 
Mar. 12 
7 00 
a.m. 
11 15 
a.m. 
8 24 a.m. 11 10 a.m. 
117 
1.72 
.40 
Mar. 13 
7 00 
a.m. 
11 30 
a.m. 
8 16 a.m. 11 25 a.m. 
160 
2.01 
.45 
Mar. 14 
7 00 
a.m. 
11 30 
a.m. 
8 30 a.m. 11 24 a.m.« 
209 
2.77 
.62 
Mar. 15 
7 00 
a-m. 
1 00 
p.m. 
8 30 a.m. 12 52 p.m. 
190 
2.43 
.41 
Mar. 18 
7 00 
a.m. 
11 30 
a.m. 
8 19 a.m. 11 29 a.m. 
128 
1.81 
.40 
Mar. 19 
Mar. 22 
Mar. 25 
6 00 
7 00 
7 00 
a.m. 
a.m. 
a.m. 
8 00 
9 30 
10 35 
a.m. 
a.m. 
a.m. 
Before work 
53 
355 
101 
0.74 
1.07 
0.98 
.37 
.43 
.27 
8>> 19™ a.m. to 9* 17™ a.m. 
Mar. 26 
Mar. 27 
6 00 
6 00 
8 10 
a.m. 
a.m. 
a.m. 
9 45 
8 10 
12 30 
a.m. 
a.m. 
p.m. 
Before work 
385 
50 
160 
2.87 
0.57 
1.87 
.77 
.26 
.43 
Do 
& 19™ a-m. to ll h 30™ a.m.» 
Mar. 28 
6 00 
a.m. 
10 25 
a.m. 
8 07 a.m. 9 09 a.m. 
147 
2.17 
.49 
Mar. 29 
6 00 
a.m. 
12 15 
p.m. 
9 57 a.m. 10 55 a.m. 
130 
1.55 
.25 
Apr. 8 
6 00 
a.m. 
11 30 
a.m. 
8 06 a.m. 11 18 a.m. 
145 
1.69 
.31 
Apr. 9 
7 00 
a.m. 
11 15 
a.m. 
8 18 a.m. 10 59 a.m. 
115 
1.52 
.36 
Apr. 16 
6 00 
a.m. 
11 15 
a.m. 
9 48 a.m. 11 03 a.m. 
165 
1.81 
.34 
11 15 
a.m. 
Averagt 
4 45 
p.m. 
After work 
117 
1.68 
.31 
0.39 
1 Probably ate a light meal shortly before the collection of the urine. 
* Without load, with pedals rotated by motor. Times for beginning and ending approximate. 
* Without load, with pedals rotated by motor, lO 8 37™ to ll h 32™ a.m.; work with resistance ll h 32™ aan. to 
12"> 16™ p.m. 
* Probably began work before 8 h 30™ a.m. 
S Work done in two periods, 8 h 19™ to 9> 21™ a.m. and 10& 38™ to ll h 30™ a-m. 
