FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 



17 



in tables and also reproduced in graphic form. This experiment 

 in common with many others was concluded after 153 days on Janu- 

 ary 10, 1910, bya fire which destroyed all of our experimental animals. 

 Tables I and II give the data for the "control" rats xn 

 and xiii, which had been obtained up to January 3, 19 10, a period 

 of 147 days, at the end of which time both rats showed a distinct gain 

 in weight and a considerable gain of nitrogen : 



Table II. Summary of Data on "Control" Rat XIII, fed on Dog Biscuit-Lard 



Diet for 147 Days. Daily Averages. 



These and other analytical data have been introduced in this 

 paper in part reproduced in graphic form. In all of the charts the 

 abscissa units represent days, and the ordinate units food (broken 

 line) or body- weight (solid line). The food-intake curve is plotted 

 from the total amount eaten per week. The average daily nitrogen 

 balance is indicated as above ( + ) or below ( ) the heavy line (o). 



