36 



FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 



Table XIX. Summary of Data on Rat XXXV, fed on Pure Casein (as the only 

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



Period i. Dog Biscuit-Lard Diet. 



Intake. 



Date of 

 experiment. 



Body- 

 weight. 



Nitrogen output. 



1909. 



Nov. 8. 



15- 

 22. 



1909. 

 Nov. 29. 

 Dec. 6. 



Food. 



gm. 



Nitrogen. Urine. 



gm. 



gm. 



gm. 



1 16.5 



122 .7 6. 5 o. 1 10 O. IOI 



126.2 6.2 j 0.102 ! o. 074 



Faces. Total. 



gm. 



gm. 



0.020 



0.017 



o. 121 

 0.091 



N-utilization. N-balance. 



p. Ct. 



82 

 83 



Period 2. Casein Diet 3. 



64 



77 



gm. 



001 1 

 +0.01 1 



-0.017 

 - o . 002 



1909. 



Dec. 13. 



20. 



27- 

 1910. 

 Jan. 3 . 



Period 3. Casein Diet 4. 



78 



89 



84 

 84 



+0.038 

 +0.095 

 +0.036 



+0.033 



Table XX. Summary of Data on Rat XXXVII, fed on Pure Casein (as the 

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



Period i. Dog Biscuit-Lard Diet. 



Date of 

 experiment. 



1909. 

 Nov. 8. 



'5- 

 22. 



Intake. 



Body- 

 weight. 



FlM.d 



gm. gm. 

 42.7 



153.2 8.7 



156.3 i 7-8 



Nitrogen 



gm. 



o. 146 



o. 128 



Nitrogen output. 



Urine. Faeces. Total 



gm. 



gm. 



gm. 



N-utilization. N-balance. 



p. Ct. 



0.1 15 0.023 

 O.091 O.026 



O.138 



o. 1 17 



84 



80 



gm. 



+0.008 

 +0.01 1 



Period 2. Casein Diet 5. 



1Q09. 

 Nov. 29. 

 Dec. 6. 



136.7 

 136.0 



4.6 



5-7 



0.070 

 0.088 



0.072 

 0.071 



0.024 

 0.034 



0.096 

 o. 105 



66 

 61 



0.026 

 0.017 



Period 3. Casein Diet 6. 



1909. 



Dec. 13. 



20. 



27- 



1910. 

 Jan. 3. 



78 

 89 

 85 



86 



+0.006 

 +0.054 

 +0.013 



+0.009 



