6 BULLETIN 310,, IT. S. DEPARTMENT OF AGRICULTURE. 
cooked lard was digested by mice and that raw lard was from 74 to 
89 per cent digested by guinea pigs. 
To secure data regarding the thoroughness of digestion of lard by 
normal individuals living under uniform conditions, nine tests were 
made in this laboratory and six different subjects were used. The 
experiments were performed in different seasons of the year, because 
of the belief sometimes expressed that fats are better utilized in 
colder than in warmer weather. The results are recorded in the 
following tables: 
Data of digestion experiments uith lard in a simple mixed diet. 
Weight. 
Water. 
Protein. 
Fat. 
Carbo- 
hydrates. 
Ash. 
Experiment No. 38, subject J. C: 
Grams. 
1, 765. 
186.5 
1,471.5 
168.0 
Grams. 
1,086.6 
15.9 
1,278.7 
Grams. 
39.9- 
25.0 
11.8 
Grams. 
254.1 
2.1 
2.9 
Grams. 
375.9 
140.5 
170.7 
168.0 
Grams. 
8.5 
Wheat biscuit 
3.0 
Fruit 
7.4 
Total food consumed 
3.591.0 
63.5 
2,381.2 
76.7 
17.6 
59.1 
259.1 
11.2 
247.9 
855.1 
26.3 
828.8 
18.9 
8.4 
10.5 
77.1 
95.7 
96.9 
55.6 
Experiment No. 39, subject J. F.: 
1,740.5 
194.0 
1,698.7 
51.7 
1,070.3 
16.5 
1,476.2 
39.5 
26.0 
13.6 
250.7 
2.2 
3.4 
371.4 
146.2 
197.0 
51.7 
8.6 
Wheat biscuit ~ 
3.1 
Fruit 
8.5 
3,684.9 
2,563.0 
79.1 
21.1 
58.0 
256.3 
13.1 
243. 2 
766.3 
41.5 
724.9 
20.2 
10.3 
9.8 
73.3 
94.9 
94.6 
48.5 
Experiment No. 44, subject J. C: 
1.752.5 
261.0 
1,029.5 
59.5 
947.6 
22.2 
894.6 
40.1 
35.0 
8.2 
218.9 
3.0 
2.1 
532.9 
196.6 
119.4 
59.5 
13.0 
Wheat biscuit 
4.2 
Fruit 
5.2 
Total food consumed 
3,102.5 
64.0 
1,864.4 
83.3 
20.0 
63.3 
224.0 
10.9 
213.1 
908.4 
25.9 
882.5 
22.4 
Feces 
7.2 
15.2 
Per cent utilized 
76.0 
95.1 
97.1 
67.9 
Experiment No. 47, subject R. L. S.: 
1,715.6 
493. 3 
734.7 
70.7 
774.7 
41.9 
638.4 
40.8 
66.2 
5.9 
288.4 
5.6 
1.5 
597.1 
371.7 
85.2 
70.7 
14.6 
Wheat biscuit 
7.9 
Fruit 
3.7 
3,014.3 
81.0 
1,455.0 
112.9 
25.0 
87.9 
295.5 
13.8 
281.7 
1,124.7 
33.3 
1,091.4 
26.2 
8.9 
17.3 
Per cent utilized 
77.8 
95.3 
97.0 
66.0 
Experiment No. 48, subject I. D. B.: 
1,717.9 
391.8 
1,158.6 
39.3 
777.2 
33.3 
1,000.8 
40.8 
52.5 
9.3 
288.8 
4.5 
2.3 
596.2 
295.2 
134.4 
39.3 
14.9 
Wheat biscuit 
6.3 
Fruit 
5.8 
3,307.6 
117.8 
1,817.3 
102.6 
36.9 
65. 7 
295.6 
24.6 
271.0 
1,065.1 
43.1 
1,022.0 
27.0 
Feces 
13.2 
Amount utilized 
13.8 
Per cent utilized 

64.0 
91.7 
96.0 
51.1 
