52 



Anthropological Investigations. 



If we observe the averages of the different diameters in the fol- 

 lowing tables, we notice that the increase with age does not take 

 place in all of them in the same way. The maximum anterio- 

 posterior diameter increases most, the maximum lateral diameter the 

 least with the ages of the children. Thus, as children grow older 

 their heads become relatively longer and their cephalic indices 

 diminish. This fact is established by other observations on children, 

 principally by Dr. Boas' investigations. 



The measurements of the female head are throughout the smaller. 

 Besides this, the differences jn the lateral diameter of the head, 

 between the two sexes of the children, are smaller in the female than 

 are the differences in the two sexes in the anterio-posterior diameter. 

 These facts show that the female head is totally smaller and, besides 

 that, slightly more rounded than is the male head. : 



When we calculate the size of the head in proportion to the height 

 of the body we still find that the female head is the smaller. The 

 greater roundness of the female head is general in all races of people 

 and at all ages. 



The negro heads show, in the three principal diameters, a slight 

 excess in size over the same measures in the white children; but we 

 should remember that the colored children are found to be of an 

 average greater height, which may account for the greater size of 

 their head and of these diameters. 



Average Diameter Antcro-Posterior Max. of the Head of the Children, 

 According to Color, Sexes and Ages. 



