
EXPERIMENTS ON DIGESTION OF FOOD BY MEN. 179 

exercise, except for a period of three days in experiment No. 
14, when the muscular exercise was quite active, as explained 
above in the account of respiration experiment No. 4, which 
was part of digestion experiment No. 14. There is no reason 
for assuming, however, that the coefficients of digestibility of 
the food were materially affected by the muscular activity. 
TABLE 53. 
Amounts per day and percentages of nutrients digested ( coefficients 
of digestibility) in experiments above detatled. 





i proven. | Far. | asinases Value 
S SUBJECTS AND Foop MarTERIALS. 4 os 4 2 - + 4 | 2 
F Bot Outta: teOmmmee (LO py cela 
3 te rw bu u 
Z Cah Shae ee messy ee Caos 
E. O., Laboratory Janitor. 
1/ Milk, - - - - - | 128 |88.1/| 192 |97.0| 168 |84.4/2960/87.8 
2, Milk, - - - - - | 165 |90.9| 239 |95.5| 163 |85.0)/3690/89.4 
3, Wheat bread,- - - - | 59 /82.3) (?) | @) | 471 |98.7|2235|\92.4 
4 Bread and milk, - - - | 169 |97.6| 168 [98.9] 533 |98.9)/4660195.2 
By Milk; .\).= - - - - | 171 |95.6| 217 (98.1) 174 |89.5/3530/89.3 
Three Chemists. 
6| Mixed diet (see table 50), - | 105 |g1.1| 152 |96.2| 531 |99.2/4190/94.6 
EE. O., Laboratory Janitor. ! 
Wheat bread, - : 60 |gt.9} () | @) | 452 199.4/2170194.6 
9) 
Beef round, ‘milk, Sitter: oe 
i meal, bread, sugar, - 
5 137 |94.4| 120 |96.7) 399 |98.5/3430/93.3 
Beef round, eggs, butter eal 
cheese, milk, crackers, bread, 
potatoes, sugar, - “| 
12. Same diet as No. II, - III |g1.8| 107 97.1 268 |98 .4)/2665/92.6 
O. F. T., Chemist. | 
Beef round, eggs, butter, milk, 
bread, potatoes, apples, 98 |94.9) 76 |96.9| 338 |98.9)2560/94.1 
peaches, pears, sugar, ‘| 
II 132 |95.9| 120 197.4) 293 |97.9/3020/93.2 
13 

Ane SanLhystetst. 
( Beef round, butter, milk, white | 
4 bread, brown bread, oatmeal, 
an beans, potatoes, apples, " 
' sugar, - - - - 
93 91.3) 82 |95.9| 320 |97.7|2540/96.9 









The results of experiments 1, 2 and 3 are not entirely reli- 
able indications of the actual digestibility of milk and bread as 
ordinarily eaten, partly because of defects in the experiments 
themselves, which were indicated above, and partly because of 
