THYMUS 



223 



the end of the fallopian tube. When the animal is small it is 

 sometimes necessary to do this under a dissecting microscope. 

 The data collected by Jackson ('13), for unmated females, are 

 those used. The graph in chart 45 and the values in table 146 

 have been determined by formulas (32), (33), and (34). Hatai 

 ('13, '14a): Jackson ('13). 



The weight of both testes on body weight. Technic : The epididy- 

 mis (2) was removed before the testes were weighed. The graph 

 in chart 46 and the values in table 146 were determined by 

 formulas (27) (28) and (29). Hatai (13); Jackson ('13). 



.35 



.30 



.25 



.20 



.10 



05 



50 



10O 



150 



200 



250 



300 



35 



30 



20 



Age in days 



350 



25 



15 



10 



.05 



Chart 48 Showing the weight of the thymus of the albino rat according to 

 age. The observed weights are represented by 229 males (164 Jackson and 64 



Wistar) and 207 females (179 Jackson and 28 Wistar). 

 and (46). 



Table 15, formulas (45) 



Observed weight, male, female, - Computed weight. 



The weight of both epididymides. Technic : The epididymis of 

 the adult rats is usually surrounded by a mass of fat. To 

 separate the adipose tissue the caudal end of the organ is held 



