36 



Table 15. — Sotirces of energy in dietary studies in Maine lumber camps. 



Kind of food. 



Beef 



Pork. 



Sausage 



Fish 



Dairy products _ 

 Lard" 



Total animal food . 



Cereals. 



Sugars 



Vegetables - 

 Fruits 



Total vegetable food. 

 Total food 



Dietary 



No. -m. 



Per 



cent 

 8.2 



16.6 

 1.0 

 5.9 

 3.5 



11.4 



46.6 



23.5 

 7.6 



17.4 

 4.9 



53.4 



100.0 



Dietary 

 No. 393. 



Per cent. 



12.3 



6.0 



1.7 



5.6 



31.6 



47.2 



21.3 



30.1 



9.6 



1.8 



52.8 



100.0 



Average i ^jetary ' Dietary 

 and3f. No.:M. No. 394 



Per cent. 



10.3 



11.3 



.5 



3.8 



4.5 



16.5 



46.9 



22.4 



13.9 



13.5 



3.3 



53.1 



100.0 



Per cent. 



16.6 

 6.9 

 2.1 

 2.3 

 4.8 



16.9 



49.6 



19.0 



13.6 



12.4 



5.4 



Per cent. 



14.3 



10.4 



1.6 



.3 



4.6 



15.6 



46.8 



50.4 



100.0 



29.4 

 9.9 



10.9 

 3.0 



53.3 



100.0 



Average 

 Nos. m\ 

 and 394. 



Per cent. 

 15.4 

 8.6 



1-a 



1.3 



4.7 



16.3 



48.3 



34.4 



11.8 



11.6 



4.3 



51.8 



100.0 



Dietary 

 No. 393. 



Per cent. 

 10.5 

 19.7 

 1.0 

 1.3 

 «3.7 

 14.5 



49.7 



38.7 



3.9 



17.1 



50.3 



100.0 



"From eggs. 



While the men were at the camp chopping, yarding, and drawing 

 the logs to the landing, the protein was obtained about equally from 

 the animal and vegetable foods. Wlien driving logs their diet was 

 made np qnite largely of beans, and only one-third of the protein was 

 supplied by animal food. As regards energ}^, about half the total 

 amount was supplied by animal foods and half by vegetable foods in 

 all the studies, beef, pork, and lard being the most important animal 

 foods in this respect and cereals and vegetables the most important 

 vegetable foods. 



DIGESTION EXPERIMENTS WITH MAINE LUMBERMEN ON A 



MIXED DIET. 



In order to learn how completely the veiy large amount of food 

 eaten by the lumbermen was assimilated, two series of digestion 

 experiments were planned and carried out in tlie winter of 1902-3. 

 In these studies the men liad the same food as their companions who 

 were in dietary studies Nos. 393 and 394, reported on pages 24 to 30 of 

 this bulletin. They were not restricted in their food, and ate from 

 the same mixed diet, in the same room, and at the same time as the 

 rest of the crew. Three of the six experiments reported were made 

 while the crew was engaged in the hard work of cutting and yarding 

 the logs, and the remaining three while they were drawing the logs 

 from the yards to the landing. The subjects were selected as being 

 typical of the camp in vigor, in the amount of food they ate, and in 

 their capacity for work. Each exjjeriment began at noon and lasted 

 six days. With the camp conveniences it was impracticable to use 

 a marker and make a separation of the feces in the usual manner, 

 but as the food eaten during the experiments was of the same char- 

 acter as that the subjects were eating before and after the experi- 

 mental period, the feces for the six days following the one on which 

 the exi3eriment began were collected and were assumed to represent 

 the undigested residues from the food eaten. Because of the uni- 



