igoi] Charron — Fat in the Animal Body. 139 



Amount of fat formed 9730 grammes. 



Possible amount of fat from fat and protein 6872 



n 



Fat from carbohydrates 2858 g-rammes. 



The experiment which sets the question at rest, however, is 

 that undertaken by Lawes and Gilbert, at Rothamstead, with pigs. 

 Without giving all the details of the experiment which were 

 scrupulously attended to by these most reliable experimenters, I 

 may only say that they lattened the pigs during 8 to 10 weeks, 

 keeping a record of their composition at the outset and at the finish 

 and ot the food consumed, all of which was of accurately known com- 

 position. On examining the results obtained they discovered that 

 29 percent, of the fat produced must necessarily have had its origin 

 from carbohydrates. 



Another experiment, deserving of special notice proving the 

 same fact, has recently been made by Jordan and Jenter, at the 

 New York Agricultural Station. 



The experiment was made with a young and vigorous Jersey 

 cow. The cow was fed during 95 days with food from which the 

 fat had been extracted : 



Quantity of fat fed during the 95 days 1 1.6 lbs. 



M II not digested 5.9 n 



II 



digested 5.7 n 



Quantity of fat in the milk 62.9 lbs. 



II II consumed , . . . 5.7 n 



57.2 lbs. 



Therefore 57.2 lbs. of fat have to be accounted for otherwise 

 than by the fat contained in the food. Moreover at the end of the 

 experiment the cow weighed 47 lbs. more and was much fatter 

 than at the start. 



The increase in fleiih could certainly not have been large for 

 during 59 days of this period an accurate record of the nitrogen 

 income and outgo showed that the nitrogen income was repre- 

 sented by 124.3 lbs. of protein and the nitrogen outgo by 125.7 

 lbs. 



