OSBORNE AND MENDEL 



PLATE 2 



D. Rat 168, male. Weight 235 grams, which is normal for a rat of the age of 220 shown below. 



E. Rat 220, male. Age 148 days, weight 58 grams. 



F. Rat 305. Age 36 days, weight 55 grams. Showing appearance of a normal rat of same weight as 220. 

 D and E show the contrast between two rats of the same age, one of which (Rat 220) has been stunted. 



The stunted rat is not essentially altered in its bodily proportions from those of a much younger rat of 

 the same weight. 



