FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 



35 



Table XVII. Summary of Data on Rat XXXIII, fed on Pure Casein (as the 

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



Period i. Dog Biscuit-Lard Diet. 



Date of 

 experiment. 



1909. 



Nov. 1 . 



8. 



'5- 

 22. 



1909. 



Dec. 13. . 



20. . 



27.. 



1910. 



Jan. 3 . . 



N-utilization. 



p. Ct. 



83 

 S5 



78 

 85 

 83 



94 



N-balance. 



gm. 



0.026 

 0.000 



0.017 



+0.030 

 +0.088 

 +0.035 



+0.052 



Table XVIII. Summary of Data on Rat XXXIV, fed on Pure Casein (as the 

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



Period i. Dog Biscuit-Lard Diet. 



Date of 

 experiment. 



1909. 



Nov. 8. 



15... 



22. . . 



Body- 

 weight. 



Intake. 



Food. Nitrogen 



gm. gm. 



157.0 

 170.4 

 169.3 



gm. 



Nitrogen output. 



Urine. Faeces. Total. 



N-utilization. 



gm. 



gm. 



gm. 



p. ct. 



9.3 0.157 

 8.2 0.137 



o. 124 0.030 o. 154 

 0.092 0.030 0.122 



Period 2. Casein Diet 3. 



81 

 78 



N-balance. 



gm. 



+ 0.003 

 O.OI5 



1909. 



Nov. 29. 

 Dec. 6. 



1909. 



Dec. 13. . . 



20. . . 



27... 



1910. 



Jan. 3... 



Period 3. Casein Diet 4. 



79 

 70 



79 



80 



83 



o . 003 



0.007 



+0.056 

 +0.052 

 +0.070 



+0.054 



