220 



GROWTH OF PARTS AND ORGANS 



with a little practice they may be dissected out cleanly. At 

 about 40-50 days of age there appears a difference in the weight 

 of the suprarenals according to sex and with advancing age this 

 difference tends to increase. The female has the heavier supra- 



,08 



06 



02 



50 



150 



200 250 300 350 <100 450 



Chart 44 Showing the weight of suprarenals of the albino rat according to 

 body weight. The observed weights are represented by 92 (Jackson) male rats 

 below 50 grams in body weight, and 53 (Wistar) male rats above 50 grams in body 

 weight; and 84 (Jackson) female rats below 50 grams in body weight, and 29 

 (Wistar) female rats above 50 grams in body weight. Table 148, formulas (37) 

 and (38). 



Observed weight, male. 

 — Calculated weight, male. 



° Observed weight, female. 

 Calculated weight, female. 



renals. The graph for the male in chart 44 and the values for 

 the male in table 148 have been determined by formula (37). 

 The graph for the female and the corresponding tabular values, 

 by formula (38). Hatai ('13); Jackson ('13). 



