68 
DIGESTION EXPERIMENT NO. 4:18. 
Kind of food. — Bananas, oranges, walnuts, with a small quantity of 
sugar. 
Subject. — J. E. R. 
Weight (with clothes). — At the beginning of the experiment 75.3 
kilograms (166 pounds), and at the close 75.9 kilograms (167.5 pounds). 
Duration. — Four clays, with twelve meals, beginning with breakfast 
May 13, 1902. 
Table 51. — Results of digestion experiment No. 418. 
Sam- 
ple 
No. 
Kind of food. 
Weight 
of ma- 
terial. 
Total 
organic 
matter. 
Nitro- 
gen. 
Pro- 
tein. 
Fat. 
Carbohydrates. 
Ash. 
Heat of 
combus- 
tion. 
Sugar, 
starch, 
etc. 
Fiber. 
212a 
Bananas 
Grams. 
2,438 
4,051 
1,304 
190 
Grams. 
338. 88 
387. 93 
486. 05 
190. 00 
Grams. 
3.93 
6.09 
20.30 
Grams. 
24. 62 
38.11 
126. 89 
Grams. 
3. m 
5.27 
324. 99 
Gram*. 
302. 55 
326. 70 
24. 52 
190. 00 
Grams. 
8.05 
17.85 
9.65 
Grams. 
12.43 
19.05 
9.91 
Calories. 
1,434 
238a 
223a 
Oranges, navel . . . 
1,663 
3,784 
46 
Sugar 
751 
Total 
Feces (water-free) 
Amount digested. 

7,986 
1,402.86 
30. 32 
189. 62 
333.92 843.77 
35. 55 
41.39 
7, 632 
134a 
232. 13 
205. 48 
1,197.38 
85.35 
8.71 
21.61 
71.28 
54.41 
135. 21 
71.31 
85. 93 
247. 99 
74.26 
55.86 
787. 91 
93.40 
9. 28 
26. 27 
73.90 
26.64 
14. 75 
35. 64 
1,479 
6, 153 
Per cent digested. 
80. 63 
Energy of urine . . 
169 
Energy of food 
oxidized in the 
body 
5,984 
Per centof energy 
utilized 
78.41 
During this experiment the subject eliminated 1,657 grams urine, 
containing 1.76 per cent or 29.16 grams nitrogen. The average 
nitrogen balance per day was therefore as follows: Income in food 
7.58 grams; outgo in urine 7.29 grams, and in feces 2.18 grams; 
indicating a loss of 1.89 grams nitrogen, corresponding to 11.81 grams 
protein. 
The subject considered the diet of bananas, oranges, and walnuts 
more palatable than the previous one of bananas, dates, and walnuts, 
but a comparison of the results of the two tests does not indicate that 
the amount of nutrients eaten or assimilated was increased. 
In dietery study No. 362, p. 27, with the same subject, the daily 
diet furnished 85 grams protein and 2,937 calories of energy, amounts 
which are far in excess of the average values for the two experiments 
just reported. In no case was the amount to be eaten limited, but in 
the digestion experiments the diet was limited to two kinds of fruit 
and one of nuts, while in the dietary study the variety of fruits and 
nuts was larger, as may be seen by reference to Table 12. 
Considering this and the preceding experiment, the average daily 
income of protein, 46.44 grams, was evidently below the limit of 
tolerance for this subject. In both experiments a loss occurred which 
was almost identical. It would appear, then, that the nitrogen limit 
of this subject was about 10 gram* per day, when the diet furnished 
about 1,900 calories of energy. 
