96 



MAWTJAL OF OATTLE-FEEDIFG. 







Nitrogen. 



Difference. 



Duration of 



Food 







expeniiitnts. 

 Dayia. 



In food. 

 Grms. 



In excrements 

 G-rms 



Gi ms. 

 + 26 6 



Per cent. 



49 



■V yl* 



2499.0 



2525.6 



1.0 



6 





306 



308.5 



+2 5 



0.7 



9 





459.0 



460.7 



+1.7 



0.4 



6 



12 



■ 1 ■ 



« 



306.0 

 612.0 



307.2 

 611.9 



+ 1.2 

 -0.1 



0.4 

 0.0 



14 





714.0 



718.5 



+4 5 



0.6 



23 





1173.0 



1176.9 



+3.9 



0.3 



8 



J V. 



544.0 



544.3 



+0.3 



0.1 



20 



1 K f 



340.0 



335.2 



--4.8 



1.4 



58 

 3 



■ s - 



o 

 o 



986.0 

 153.0 



982.8 

 152.6 



-3.2 



-0.4 



0.3 

 0.2 



8 



J V 



408.0 



403.3 



+ 0.3 



0.07 



That this eqnilibrram between the excreted and ingested 

 nitrogen was not a chance occurrence in a single animal, is 

 shown by the fact that it was confirmed in experiments 

 on five different dogs. 



Experiments on other animals have not been lacking. 

 Ranke and Pettenkofer & Voit have shown that the 

 same fact is true of men, and an interesting experiment 

 was made by Voit on a pigeon, an animal with which 

 Bonssingault found a deficit of 84 and 36 per cent. Voit 

 fed a full-grown pigeon for 124 days with peas, of which 

 it consumed 3,132.4 grms. (dry weight), while its own 

 weight rose fi^om 371 grms. to 444 grms. The 3,132.4 

 grms. of plas contained 149.4 grms. of nitrogen, and in 

 the excrements 145.9 grms. were recovered, showing a 



