FEEDING EXPERIMENTS WITH ISOLATED FOOD SUBSTANCES. 



37 



Table XXI. Summary of Data on Rat XL, 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. 



Body- 

 weight. 



I909. 



Nov. 10. 



5- 



22. 



Intake. 



Food. 



Nitrogen 



gm. 

 150.O 

 '35 4 

 147-3 



gm. 



gm. 



2-7 



7-7 



0.045 

 o. 130 



Nitrogen output. 



Urine. 



gm. 



o. 106 



O.O96 



Faeces. 



gm. 



Total. 



gm. 



o . 007 0.113 

 o . 02 1 0.117 



N-utilization. 



p. Ct. 



84 

 84 



N-balance. 



gm. 



-0.068 

 +0.013 



1909. 

 Nov. 29. 

 Dec. 6. 



Period 2. Casein Diet 5. 



82 



67 



0.008 

 O.OOI 



Period 3. Casein Diet 6. 



1909. 



Dec. 13. 



20. 



27- 

 1910. 

 Jan. 3. 



79 

 83 

 84 



83 



+0.014 



0.009 

 0.029 



0.019 



Table XXII. Summary of Data on Rat XLII, fed on Pure Casein (as the only 

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



Period I. Dog Biscuit-Lard Diet. 



1909. 

 Nov. 29. 

 Dec. 6. 



Intake. 



Nitrogen output. 



Food. Nitrogen. Urine. Faeces. Total 



gm. 



gm. 



4.9 

 6.3 



l 0.082 

 I o . 1 06 



gm. 



0.090 

 0.069 



N-utilization. N-balance. 



gm. 



gm. 



p. ct. 



0.013 

 0.020 



o. 103 



0.089 



84 



81 



Period 2. Casein Diet 5. 



68 

 64 



Period 2. Casein Diet 6. 



gm. 



o . 02 1 

 +0.017 



-0.022 

 -0.017 



1909. 

 Dec. 13. 

 20. 



27- 

 1910. 

 Jan. 3. 



78 

 83 



81 



78 



0.007 



0.000 



0.01 1 



o . 02 1 



