266 



THE EOTHAMSTED EXPERIMENTS. 



that, in all comparable cases, there was much more uniformity 

 in the amounts of the non-nitrogenous than in those of the 

 nitrogenous substance consumed for a given live-weight of 

 the fattening animal within a given time. The deviations 

 from this general regularity in the amount of non-nitrogenous 

 substance consumed are, indeed, in most cases such that, when 

 they are examined, they tend clearly to show that the uni- 

 formity would be considerably greater if the amounts of 

 only the really available respiratory and fat-forming constit- 

 uents had been represented, instead of those of the crude or 

 total non-nitrogenous substance consumed. 



TABLE 67. — Experiments with Sheep made at Kothamsted in 1850. 

 Nitrogenous and Non-nitrogenous constituents consumed per 

 100 lb. live-weight per week ; and to produce 100 lb. increase 

 in live-weight. 



Pens. 



Limited food. 



Ad libitum 

 food. 



Per 100 lb. live-weight 

 per week. 



Nitro- 

 ge- 

 nous. 



Non- 

 nitro- 

 genous, 



Total 

 organic 



To produce 100 lb. in- 

 crease in live- weight. 



Nl- 



troge- 



Non- 

 nitro- 

 genous. 



Total 



or- 

 ganic. 



SERIES 1. 5 SHEEP IN EACH PEN (14 WEEKS). 



SERIES 2. 5 SHEEP IN EACH PEN (19 WEEKS). 



1 Only four sheep in pens 1, 3, and 4. 



