INTRODUCTION 



3 



expenditure of so much time and attention that much of 

 their value for immediate, practical application would be 

 lost if separate calculations for each case had to be made. 

 It is to avoid this that the appended Tables have been 

 constructed, enabling all persons interested or concerned 

 to gain quickly and easily correct information which 

 otherwise could only be obtained through a series of 

 laborious calculations. 



FORMULAE FROM WHICH THE TABLES ARE CALCULATED. 

 The various relationships indicated above have been 

 expressed in the following formulae (G. D., loc. cit.) : 



W= 0-38025 



_ 

 " 



X 1 ' 1442 



MALES 



W = 0-662 x 



v r _ w ' 72 

 ~~ 3 



v r - x2 ' 257 

 "617172' 



1-5595 



W = 0-36093 x 



16-4951 



FEMALES 

 Tx~; W =0-30213 x 



V G - 



W ' 72 . 

 0-79348 ' 



V.C.= 



X 2 ' 30 3 ^ 



8-2714' 



W = weight of the body in grammes ; X = length of the trunk in 

 centimetres ; Ch. = circumference of the chest in centimetres ; V.C. = 

 Vital Capacity in cubic centimetres. The constants for Vital Capacity 

 represent Class A (p. 16). 



It is only when the meaning of " the normal " with 

 respect to these measurements is understood, and when 

 the limits of the normal have been properly denned, that 

 it will be possible to study with any prospect of accuracy 

 or success the deviations from the normal, and to give a 



