284 GROWTH OF PARTS AND ORGANS 



Transpose 15 from right hand side to the left and take the 

 logarithm of both sides. We have 



. (100 X 150 - 1.1 X 150) + 13400 

 log (Bd.wt. + 15) = log 10 X v - 



= 1.9745 



Thus 1.9745 is equivalent to the logarithm of body weight plus 

 15. Therefore body weight + 15 = 94.3 (anti-logarithm 

 of 1.9745). Finally, body weight = 94.3 -- 15 = 79.3 grams. 



The above procedure is that to be followed with other formulas 

 of the same type. 



BODY WEIGHT ON BRAIN WEIGHT (DONALDSON, '08) 



Br. wt. 0.554 



Body weight (sexes combined) = 8.7 + 10 - 569 (6) 



TAIL LENGTH ON BODY LENGTH (.HATAI, MS '14) 



Tail length: male = 0.852 Bd. I + 38.8 (log Bd. L) - 90.5 (7) 

 Tail length: female = 0.874 Bd. I + 43.2 (log Bd. 1) - 98.1 (8) 

 Formulas (7) and (8) were used for table 144. 



BRAIN WEIGHT ON BODY WEIGHT (HATAI, '09 a, p. 172) 



For the brain weight of sexes combined, the following form- 

 ulas have been obtained : 



Brain weight (sexes combined) = 1.56 log (Bd. wt.) 0.87 (9) 



[5 < Bd. wt. < 10 gms.] 

 Brain weight (sexes combined) = 



0.569 log (Bd. wt. - 8.7) +0.554 (10) 

 Bd. wt. > 10 gms.] 



