1905 - 6 .] Effects of Varying Diets upon Growth and Nutrition. 89' 
tion appears to be weakened, and the mortality in the progeny 
is high. Adult rats can live on horse flesh and maintain their 
weight. 
Ox Flesh . — An ox-flesh diet is tolerated by very young rats. 
better than horse flesh. About one-third of the animals failed to 
thrive, and succumbed within one or two months ; the remainder 
appeared to thrive, but their gain in weight was appreciably less 
than in the control, bread, and skim-milk fed subjects. None of 
these animals became pregnant. In young rats set. 2 to 3 months 
an ox-flesh dietary is conducive to rapid growth and development ; 
