ANTHROPOMETRY 45 



certain age, physiological or chronological, should 

 have a certain shoulder girth, or chest expansion, 

 or the like, for the simple reason that a table of 

 usual averages would make both the slender and 

 thick-set types abnormal, whereas they are per- 

 fectly normal and healthy types. Of course, too, 

 there are types that fall in between these two 

 extremes. We might say there is a "medium" 

 type of build, which is really an average of all the 

 builds, and possibly 40 per cent of all children 

 might conform to this average or medium type. 

 Naturally we cannot consider all the intermediate 

 variations, for to tabulate them would make the 

 process far too cumbrous. But it is a fairly 

 simple matter to distinguish the three obvious 

 types — the slender, the medium, and the heavy 

 — and arrange height tables for each type of 

 physique. Chronological age tables cannot be 

 relied on, particularly in the United States, where 

 there is an intermingling of such a variety of 

 races that average heights for different ages vary 

 greatly. Therefore, if we are to have an effective 

 table of proportions for muscular development, 

 we will have to consider the three types along with 

 a height standard, and though chronological age 

 averages may be mentioned, they must not be 

 given very great value. 



The measurement tables published in this book, 

 therefore, are arranged according to height and 



