34 



FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 



Table XV. Summary of Data on Rat XXXI, fed on Pure Casein (as the only 

 Protein) and Salt Mixture III for 42 Days. Daily Averages. 



Period i. Dog Biscuit-Lard Diet. 



Date of 

 experiment. 



1909. 



Nov. 1 . 



8. 



15- 

 22. 



1909. 

 Nov. 29. 

 Dec. 6. 

 '3- 



1909. 

 Dec. 20. 



27- 

 1910. 

 Jan. 3. 



Intake. 



Body- 

 weight. 



Nitrogen output. 



N-utilization. N-balance. 



Food. Nitrogen. Urine. Faeces. Total. 



gm. 



gm. 

 181. 7 

 204.2 10.8 

 204 .5 8.2 

 197. 1 7.7 



p. ct. 



Period 2. Casein Diet i. 



Period 3. Casein Diet 2. 



86 

 92 

 81 



80 



83 

 80 



82 

 89 



82 



gm. 



+0.008 

 +0.018 

 o . 009 



0.018 

 +0.018 

 +0.043 



+0.065 

 +0.051 



0.012 



Table XVI. Summary of Data on Rat XXXII, fed on Pure Casein (as the 

 only Protein) and Salt Mixture III for 42 Days. Daily Averages. 



Period i. Dog Biscuit-Lard Diet. 



Date of 

 experiment. 



1909. 

 Nov. I . 



8. 



15- 

 22. 



1909. 

 Nov. 29. 

 Dec. 6. 

 13 



1909. 

 Dec. 20. 



27- 

 1910. 

 Jan. 3. 



Intake. 



Nitrogen output. 



Body- 

 weight. 



Food. Nitrogen. Urine. 



gm. 



180. 



gm. 



5 



N-utilization. N-balance. 



Faeces. : Total. 



gm. 



?m. 



gm. 



196.7 

 200 3 

 201 .4 



9 3 



7-4 

 9.2 



o. 148 

 o. 120 



0.145 

 0.099 



o. 152 O. I I I 



0.017 

 0.020 



0.034 



gm. 



p. ct. 



m. 



o. 162 

 o . 1 1 9 

 0.145 



Period 2. Casein Diet i. 



Period 3. Casein Diet 2. 



0.015 o. 128 

 0.018 o . 1 72 



0.020 o. 180 



89 



83 



78 



0.014 

 +O.OOI 

 +0.007 



84 



82 

 82 



0.000 



0.000 



+0.016 



90 

 91 



90 



+0.025 

 +0.020 



+0 018 



