470 



GROWTH 



Pfaundler gives the following examples : 



(i.) A boy aged 1 year has a conceptional age A = 175 yr. 



Hence lengtli = 



1-75 _ 



4-75 



— \/0'36 ^ 0*72 metre, which compares favourably 



with the value given in Table LXXXIII. 

 (ii.) A boy aged 8 yrs. has A = 8"75. 



Hence length = . /^ = JVU = 1-23 metres. 

 V 4-75 



(Average length of boy of 8 yrs. = 1-20 metres.) 



TABLE LXXXIIT 



Table LXXXIII. is from Pfaundler's data. It gives the calcu- 

 lated and observed weights for each age as well as his values for ?/? 

 and the centimetre index. 



The ratio, weight in Kg. /length in centimetres, is called the centimetre 

 index. Sometimes the ratio is modified as in Levi's ratio, which is 



100 i^/wt. in grams 

 length in cm. 



This ratio diminishes as age increases up to puberty. 



Dreyer suggests that instead of the total length of the body it would be 

 better to deal with the sitting height. 

 He has established the following ratios : 



Males, W = 0-38025 '-''l/l ; 



Females W = 0-36093 " ■'>V^ ; 

 W = weight of the body in grams. 



where 

 and 



I = length of trunk in cm. 



Note. — The values of m in Table LXXXTII. have been multiplied by 10^ for convenience. 



