8o — 



The lambs fed on nitrogenous food, or Lot IV, made much the 

 largest average gain, and those fed on carbonaceous food, or Lot 

 III, made the smallest gain, though not very much smaller than 

 Lot VI. 



Animal individuality, a very perplexing consideration in all 

 work of this kind, shows its influence very strongly here. If we 

 study the individual gains of the animals we find that there is a 

 much greater difference in the gain of the two lambs in Lot III 

 than there is in those of any of the other lots. Lamb No. 21, in 

 Lot III, the smallest of all at the beginning, made almost as large 

 a gain as any in the whole lot, and far greater than its companion. 

 Of course, it is impossible to say that this is an individual varia- 

 tion ; and it may be urged that No. 1 1 was quite as likely to be 

 the eccentric individual as No. 21, but it will be remembered that 

 the third lamb of this lot. No. 12, made almost no gain at all, so 

 that circumstances indicate that No. 21, the smallest of all at the 

 beginning, was affected by influences not affecting the others. 

 However this may be, the calculations are based on the figures as 

 they stand. 



Notwithstanding the gain in live weight was very markedly in 

 favor of the lambs fed on nitrogenous food, it is when we come to 



