242 



STORRS AGRICULTURAL EXPERIMENT STATION. 



average of the results of eighteen experiments with the same 

 two and one other subject, in which each of these nutrients, 

 though varying in different experiments, was in no case espe- 

 cialh' large. 



Comparison of results of ' 'fat diet ' ' and ' ' carbohydrate diet ' ' 

 ivith those of ordinary diet. 



Average 14 experiments with carboliy- 



drate diet, . . - . - 



Average 17 experiments with fat diet, - 



Average 18 experiments with ordinary 



diet, 



89.1 

 90.6 



92.4 



% 



94-3 

 96.7 



94-5 



Carbo- 

 hydrates. 



98.2 

 97.0 



97-9 



Energy. 



92.7 

 91.7 



90-5 



The average coefficient for carbohydrates is very slightly in 

 favor of the diet with the larger quantity; for practical pur- 

 poses it is the same as that for the ordinary diet. In the case 

 of the fat the difference was more noticeably in favor of the 

 diet with the large quantity; that is to say, where the quantity 

 of fat was largest in these experiments the coefficient of avail- 

 abihty was greatest. The protein in the diets with the large 

 quantities of fat and carbohydrates was less available than in 

 the ordinary diet. This is due more probably to what has 

 already been pointed out, namel}', that the proportion of vege- 

 table protein in the diet was much larger in the former experi- 

 ments, than to any effect of the increase in the quantity of one 

 nutrient in the diet upon the availability of the others. In 

 fact, there does not appear to have been any such effect; the 

 availability of the fat in the ration with the large amount of 

 carbohydrates was almost identical with that in the ordinary 

 diet; while the availability of the carbohydrates was very 

 nearly as large in the diet with the large quantities of fat as 

 in the ordinar}^ ration. 



In a previous report of this station* an attempt was made to 

 establish factors for the digestibility of the nutrients of mixed 

 diet which could be put into general use. The results of some 

 of the experiments given in the present article were niade use 

 of there, together with results of a number of experiments 



* Report for 1S99, p. 86. 



