160 GROWTH OF PARTS AND ORGANS 



Body Weight on Body Length (Donaldson, 'O'J) 



By transposing formula (1) we obtain 



Bd.l.+lU 



Body weight (sexes combined) = 10 143 — 15 (2) 



As the body length for a given body weight is for the male 1.1 

 per cent above the value in (2) and for the female 1.1 per cent 

 below the value in (2), two new formulas have been made for 

 the male and female respectively — thus 



(100 Bd. l.-l.l Bd M+13400 



Body weight:— male = 10 14300 -15 (2a) 



(100 Bd. I. +1.1 Bd. l)+13400 



Body weight:— female = 10 1430 ° -15 (2b) 



By use of formulas (2a) and (2b) the body weights corre- 

 sponding to body lengths from 50-250 mm have been computed 

 for each sex and the values obtained are those entered in the 

 accompanying tables. 



To illustrate the procedure with a formula of this sort the 

 following example is given. 



To compute the body weight for a body length of 150 mm. 

 (male) by the following formula (2a) . 



