WEIGHTS OF UNDERFED YOUNG ALBINO RATS a2 
combined) for the younger controls to 2.915 grams for the 
‘underfed individuals. The increase amounts to near y 24 per 
cent (uncorrected for slight difference in body weight). 
Similarly, the data for the moist cartilaginous skeleton (table 1) 
show a marked increase in the underfed rats. For the test ani- 
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Fig. 1 a. External ear of a normal albino rat two weeks of age weighing 15.0 
grams. X 4. b. External ear of an albino rat underfed from birth to three 
weeks of age. Weight of rat was11.5 grams. X 4. ce. External ear of an albino 
rat underfed from birth to ten weeks of age. Weight of ratwas15.4 grams. X 4. 
d. External ear of anormal albino rat ten weeks of age weighing 89.0 grams. X 4. 
mals ten weeks of age the average absolute weight of the moist 
cartilaginous skeleton (2.470 grams) exceeds that for the younger 
controls (1.597 grams) by 0.873 gram, an excess of about 54 per 
cent. At other ages the differences are also very striking. 
