OSBORNE AND MENDEL 



PLATE 1 



B 



A. Rat 238, female. Age 1 40 days, weight 144 grams, which is normal for a rat of same age as 240. 



B. Rat 240, female. Age 140 days, weight 55 grams. Same brood as Rat 238. 



C. Rat 305. Age 36 days, weight 55 grams. Showing the appearance of a normal rat of same size as 240. 

 A and B show the contrast between two rats of the same age, one of which (Rat 240) has been stunted. 



The lower two pictures afford a comparison between two rats of the same weight, but widely differing in 

 age. The older, stunted rat, B, has not lost the characteristic proportions of the younger animal, C. 



