162 CHARLES K. STOCKARD AND A. L. JOHNSON 



irregularities. The individual discords in both canine charts 

 are due to the lateral flaring of the canines in bulldog-typed 

 heads. 



The maxillary incisal alveolar widths (pi. 35, fig. 1, A) are 

 arranged in text-figure 10. This measurement ranges from 

 40 to 13 mm or as 3:1, and there is a general but irregular 

 accord with the sequence of zygomatic widths. This accord 

 is much the same as that for the palatal widths. All three 

 charts show a somewhat rhythmical discord in spite of the 

 general similarity in slope. 



/o 



Text-figure 10. Sequence A. Maxillary incisor alveolus width. Same skull 

 sequence as text-figure 2. 



The comparison of zygomatic widths with the eight dif- 

 ferent groups of measurements in this series of skulls brings 

 out several interesting facts. In the first place, zygomatic 

 and cranial widths are quite independent of each other, and 

 a wide or narrow cheek may occur in heads with the same 

 cranial width measurement. In addition, there is much less 

 range in cranial widths than in zygomatic widths. 



Secondly, the interorbital width, although to some extent 

 involving cranial bone, follows with fairly close accord the 

 zygomatic width. This agreement is associated with the fact 

 that the maxilla joins the frontal bone in forming part of 

 the orbit as well as giving the zygomatic process to form the 

 anterior portion of the zygomatic arch. The degree of lateral 

 divergence of this process of the maxilla affects both the 



