18 THE TABLES: EXPLANATORY 



GLASS B 



Professional classes (doctors, lawyers, etc.). 

 Business men. 

 Railwaymen. 

 High-grade mechanics. 



Children in upper class schools (may be in Class A depending 



on school). 

 Clerks, upper class. 



CLASS C 

 Tailors. 

 Shopkeepers. 

 Shoemakers. 

 Printers. 

 Potters. 



Clerks, lower class. 

 Painters. 



Elementary School children. 

 Factory children. 



Variations from the Normal in Physical Fitness. 



As a result of the examination of a large number of 

 apparently healthy people who, from mode of life or 

 occupation, should belong to Classes A, B, or C respectively, 

 it can safely be stated that if a person is found to have as 

 much as 10 per cent, less vital capacity than is normal 

 for his class, it is probable that he is suffering from some 

 health-depressing condition, and if he is as much as 15 

 per cent, below the normal limit it is practically certain 

 that he is abnormal in this respect. 



Vital Capacity in Disease. In studying the changes 

 in vital capacity taking place during various diseases, 

 for instance pulmonary tuberculosis, the Tables should 

 be used in exactly the same manner as has been in- 

 dicated above. 



First, find out from the trunk-length and chest-measure- 



