70 
INCOME AND OUTGO OF NITROGEN. 
As will be seen by reference to the tables reporting the results of 
the individual tests, there was considerable variation in the income and 
outgo of nitrogen with the different subjects. Table 53 summarizes the 
data on this topic, recording the tests in which maximum and minimum 
gain or loss was noted, and also shows the energy in the several cases. 
Table 53. — Income and outgo of nitrogen — Summary of daily maxima and minima 
gains and losses. 
Exper- 
Nitrogen. 
Energy 
iment 
No. 
In food. 
In urine. 
In feces. 
Gain ( + ) 
or loss i - i. 
Grams. 
-3.33 
- .04 
-4.12 
+ .21 
-3.69 
- .05 
-5.62 
+ 1.29 
-1.89 
-1.82 
- .35 
of daily 
diet. 
407 
SUBJECT C. P. H. 
Maximum loss 
(16 experiments). 
Grams. 
5.66 
7.18 
11.40 
7.14 
2.20 
7.60 
15. 00 
8.62 
7.58 
7. 28 
14.06 
( Trams. 
7.25 
4.53 
4.99 
5.11 
4.67 
5.84 
7.40 
5.59 
7.29 
6.89 
10.68 
'Trams. 
1.73 
2.69 
2. 29 
1.82 
1.22 
1.81 
1.98 
1.74 
2.18 
2.21 
3. 73 
( 'alories. 
3, 279 
397 
402 
399 
388 
Maximum gain . . . 
Minimum gain ... 
SUBJECT W. S. If. 
Maximum loss 
(11 EXPERIMENTS i. 
2.768 
1,712 
405 
2,870 
394 
Maximum gain ... 
Minimum gain . . . 
393 
418 
SUBJECT J. E. R. 
(2 EXPERIMENTS). 
2,544 
417 
Minimum loss 
2.910 
416 
SUBJECT A. V. 
(1 EXPERIMENT). 
3,793 
As may be seen by reference to the table, the daily excretion of 
nitrogen in the urine in these experiments with fruitarian or vegeta- 
rian diets was small. It must be remembered in this connection that 
under ordinary conditions the daily excretion of nitrogen in the urine 
depends mainly on the amount of nitrogen ingested in the food and 
not on the nature of the diet, and in these tests the amount of protein 
in the food eaten per day was small. 
It appears that for subjects W. S. M. and C. P. H. the minimum 
daily losses (0.04 gram and 0.05 gram) are reported for the experi- 
ments where the nitrogen ingested is 7.18 grams and 7.60 grams, 
respectively, thus implying that to attain nitrogen equilibrium, with 
the same amount of energy as was furnished by the diet studied, these 
subjects should receive at least 8 grams of nitrogen per day. The 
loss of nearly 2 grams of nitrogen per day, experienced by subject J. 
E. R. in the two experiments with an income of 7 to 8 grams per day, 
would seem to indicate that, at least in a fruitarian diet with the same 
amount of energy, the nitrogen required daily would be about 10 
grams. 
The comparatively large daily income of nitrogen (14.06 grams) 
reported for subject A. V. was insufficient for the maintenance of his 
nitrogen equilibrium, although it was practically twice as great as that 
