222 



GROWTH OF PARTS AND ORGANS 



6. The third group of the organs here considered is formed by 

 those the growth of which is represented by a sinuous graph in which 

 the most marked rise appears shortly before puberty. These organs, 

 so far as examined, are the ovaries, the testes, epididymis and the 

 thymus. 



EPIDIDYMIS 2 



WEIGHTGRAMS 



BODY WEIGHTGRAMS 



1.2 



1.0 



50 



100 



150 



200 



250 



300 



350 



400 



450 



Chart 47 Showing the weight of epididymides of the male albino rat ac- 

 cording to body weight. The observed weights are represented by 152 rats 

 entered according to the groups given in table 147, formulas (30) and (31). 



Observed weight. 



Calculated weight. 



The weight of both ovaries on the body weight. Technic: The 

 ovaries must be carefully dissected from their capsules and from 



