164 GROWTH OF PARTS AND ORGANS 



As the value of 1 is 10, the formula (12) may be transformed 

 by a series of steps here omitted, to read 



. 



20 J 20 



- 0.9 (12a) 



Where D n = Diameter of nucleus in /* 

 and D c b = Diameter of cell body in /z. 

 See table 31. 



WEIGHT OF BOTH EYEBALLS ON BODY WEIGHT. (HATAI, '13, p. 112) 



Weight of both eyeballs (sexes combined) = 



0.000428 Bd. wt. +0.098 log Bd. wt. - 0.041 (13) 



Formula (13) was used for table 68. 



WEIGHT OF HEART ON BODY WEIGHT (HATAI, '13) 



Weight of heart (sexes combined) = 

 0.0026 (Bd. wt. + 14) + 0.249 log (Bd. wt. + 14) - 0.336 (14) 



Formula (14) was used for table 69. 



WEIGHT OF BOTH KIDNEYS ON BODY WEIGHT (HATAI, '13) 



Weight of both kidneys (sexes combined) = 



0.00718 (Bd. wt. - 3) + 0.132 log (Bd. wt. - 3) -0.009 (15) 



Formula (15) was used for table 69. 



