108 EXAMPLES 



Therefore the person has 2% greater vital capacity than she 

 should have according to the Tables for Class A, calculated 

 from the weight of the body. 



To check the vital capacity as calculated from the weight 

 of the body, proceed as follows : 



Vital capacity derived from length of trunk (88-8 cm.) 



= 3667 c.c. (from Table XI., Class A). 



Vital capacity derived from circumference of chest (75-0 cm.) 

 = 3438 c.c. (from Table XII., Class A). 



Averaging 3667 + 343 J = 3553 c.c, which is the normal 



vital capacity for Class A corresponding to the length of 

 trunk and circumference of chest. 



Subtracting the calculated from the observed vital capacity, 

 3630 - 3553 = +77 c.c. 



+2-170/0 (or roughly +20/o) . 



Therefore the person has 2% greater vital capacity than she 

 should have according to the Tables for Class A, calculated 

 from length of trunk and circumference of chest. 



Example 2 



MALE, AGE 13 YEARS 



F Weight of body = 40-5 kilograms 



I Length of trunk =77-1 centimetres 



J i Circumference of chest = 72-0 centimetres 

 \ Vital capacity = 2880 cubic centimetres 



CALCULATION 



Weight from length of trunk = 39-73 kilos. 

 Weight from circumference of chest = 39-61 kilos. 

 Averaging 39-73 + 39-61 -*- 2 = 39-7 kilos = = weight cal- 

 culated. 



Subtracting calculated from observed weight, 

 40-5 -39-7 = = +0-8 kilos. 

 +0-8 x 100 -s- 39-7 =: +2-01%. 

 Therefore the person is 2-01% too heavy. 



Vital capacity from weight = 3010 c.c. (Class A) = (vital 

 capacity calculated from weight). 



