CLASSI1 K'ATION OF HI II. I). 



27 



to plot the data in this polygon by using as abscissse the Logarithms 



of the index of build rather than the absolute indices, Bince the 

 range of weight above the mode is. for obvious reasons, very much 

 greater than below the mode. Taking mean weight at tis k'_ r .. or 150 

 pounds, the minimum weight is about 20 kg. (45 pounds), or _'.") kg. 

 (55 pounds) below the mean, and the maximum weight is about 

 150 kg. (330 pounds), or 182 kg. (400 pounds) above the mean. That 



INDICES Cs 

 Of BUILD ui 



l-~ CO Ol 



fNJ Cii Ci £2 « S^ 



LO to 



r* r~ co <D O o 



— : — - - oj c\i 



a 



S3 



±n to r- oO O) O - w <^ tj in toPSJi 



cm cm n ^ *5 i/i (or^- n oo o> So- -rjpi" 



cm" cm cm' cm cm cm cm cm «\i ro csic^firofncidnron 



nm^ni*. 



| VERY SLENDER | SLENDER | MEDIUM FLESHY VERY FLESHY 



Fig. 7. — Polygon of frequency of the various indices of build (weight : stature 1 ). Prom last 



column of table 12, with slight modifications. 



is, the range of weight classes is three times as great abi below 



the mean. Plotting data in logarithmic fashion, as shown in figun 7 

 it appears that the modal index of build is 2.3 (33). The range is 

 from 1.4 (20) to 4.5 (64). Using the logarithms of abscissa 1 , t In- 

 curve is more nearly a symmetrical one. It is more irregular above 

 than below the mode, because the classes are more numerous and the 

 frequency of each class smaller. The presence of two mod< 

 gestive of the hypothesis that the medium class and probably the 

 fleshy classes are not strictly homogeneous, but, on the contrary, coin- 

 prise groups of individuals whose build is due to dissimilar factors, Of 

 sets of factors. 



Table 9. — The five standard classes of build; limits and middle point 



