THE TABLES: EXPLANATORY 15 



he (ii) possibly has an abnormal weight ; while if he 

 differs from the normal by as much as 10 per cent., he 

 is (iii) probably abnormal in this respect ; and if the 

 deviation reaches as much as 15 per cent., his weight is 

 (iv) certainly abnormal. Where groups of persons are 

 concerned, the required percentage deviations are dif- 

 ferent, but it is possible in each case to say with the 

 same degree of certainty that the weights are either 

 normal, or possibly, probably, or certainly abnormal if 

 the percentage differences are as much as 2, 4, and 6 

 respectively. 



If a person be found to have a weight normal in re- 

 lation to his trunk-length, while the weight derived from 

 the chest-circumference is either considerably above or 

 considerably below the normal, this fact will show that 

 the chest is either abnormally large or abnormally small 

 in proportion to the length of the trunk and the weight. 

 To ascertain the chest-measurements normally corre- 

 sponding to a given normal trunk-length, or the trunk- 

 length corresponding to a normal chest-circumference, 

 Table III. or Table IX. is used. 



Vital Capacity and Physical Fitness. In the 

 Tables dealing with vital capacity in its relation to weight, 

 trunk-length and chest-circumference, it will be found 

 that for each given weight or measurement three readings 

 of vital capacity are recorded, in the columns marked 

 A, B, and C respectively, for both males and females. 

 The reason why three sets of figures are given is that 

 different degrees of vital capacity will be found in persons 

 all apparently in good health, and differing only in their 

 physical fitness. It has been found that an individual 

 living a healthy, outdoor life, or compensating for a 

 sedentary life by regular exercise or sport, will have a 



