THE DIGESTIBILITY OF THE DASHEEN. 5 



meal of the experimental period and with the first meal succeeding 

 the test period; the resulting dark coloration of a portion of the 

 feces makes it possible, generally, to separate very accurately the 

 feces from the experimental diet from the remainder voided at the 

 same time. The feces for each experiment were deposited in tared 

 glass containers and were dried in an electric oven regulated to main- 

 tain a temperature of 95° C. When dry, the total amount of feces for 

 each subject was finely ground and thoroughly mixed for analysis. 

 Samples of both food and feces, the latter reported on " water-free " 

 basis, were analyzed to determine the percentages of protein, fat, and 

 carbohydrates, according to the methods outlined by the Association 

 of Official Agricultural Chemists, 1 and from a comparison of the re- 

 sults it was determined how much was actually digested. 



The data essential for the interpretation of the results of the 

 digestion experiments are given in the tables below, and include 

 the total amount of food eaten, the amounts of protein, fat, and 

 carbohydrates supplied, the weights of the feces and their constit- 

 uents, and the coefficients of digestibility of the protein, fat, and car- 

 bohydrates of the diet. 



EXPERIMENTS WITH IMMATURE DASHEENS. 



Six experiments were made with immature dasheens and, while 

 these were not all carried on at the same time, the subjects and all 

 experimental conditions were the same throughout. The results are 

 given in the following table : 



Data of digestion experiments with immature dasheens in a simple mixed diet. 



Food. 



Total. 



Water. 



Pro- 

 tein. 



Fat. 



Carbo- 

 hy- 

 drates. 



Ash. 



Experiment No. 513, subject A. ,T. H.: 



Grams. 



1,430.0 



2,530.0 



131.0 



482.0 



Grams. 



983.1 

 2,201.1 



113.8 

 53.0 



Grams. 



24.2 



75.9 



1.0 



4.8 



Grams. 



2.3 

 101.2 



0.3 

 409.7 



Grams. 



406.4 



126.5 



15.2 



Grams. 

 14.0 



Milk 



25.3 



Fruit 



0.7 





14.5 









4,573.0 

 98.0 



3.351.0 



105.9 

 33.4 

 72.5 



513.5 

 30.6 

 482.9 



548.1 



17.7 



530.4 



54.5 





16.3 







38.2 

















68.5 



94.0 



96.8 



70.1 











Experiment No. 514, subject P. K.: 



1,599.0 



2,363.0 



741.0 



340.0 



1,099.3 



2, 055. 8 



643.9 



37.4 



27.0 

 70.9 

 5.9 

 3.4 



2.6 



94.5 



1.5 



289.0 



454.4 

 118.2 

 86.0 



15. 7 



Milk 



23.6 



Fruit 



3.7 





10.2 









5,043.0 

 34.0 



3,836.4 



107.2 

 10.0 



97.2 



387.6 



8.2 

 379.4 



658.6 



10.6 



648.0 



53.2 



Feces 



5.2 







48.0 

















90.7 



97.9 



98.4 



90.2 











1 U. S. Dept. Agr., Bur. Chem. Bui. 107 (1912), rev. ed. 



