ALBINO RAT VISCERA, GLANDS, EYEBALLS: WEIGHTS 107 



out a* special formula for it. Consequently the following for- 

 mulas represent onl}^ the two remaining phases. The weight of 

 the testes on body weight between 5 and 10 grams may be cal- 

 culated with a sufficient degree of accuracy from the values given 

 by a straight line which joins the observed weight at 5 grams with 

 the calculated weight at 10 grams in body weight. 



Testes =0.043 -0.000966 Bd. wt. +0.000163 Bd. wt.^ 



[10 < Bd. wt. < 80] 

 Testes = 2.910 log Bd. wt. - 4.520 [Bd. wt. > 80] 



The constants of the formula were determined from 121 male 

 rats, and the relation between observed and calculated values 

 is shown in chart 7. 



Although I have not considered such factors as the season 

 and age, yet from the functions of these organs, it seems probable 

 that data controlled for both those factors would be less vari- 

 able than that here presented. 



.06 



.04 



.03 



.02 



.01 



OVARIES 2 

 WEIGHT GRAMS 



100 



;__ BODY WEIGHT GRAMS 



200 



250 



300 



Chart 8 Showing the weight of ovaries of the female albino rat according to 

 body weight. The observed weights are represented by 136 (Jackson) rats. 

 O Observed weight. Calculated weight. 



8. Ovaries. The growth of ovaries in weight is even more 

 complicated than that of the testes. We notice in the ovaries 



