GENETIC TYPE AND THE ENDOCRINES 199 



composing similar skull regions are difficult to detect except 

 by the arrangement of the measurements under consideration 

 in a proper sequence. The sequence used for text-figures 

 40-42, although comparatively fair, could give no ready in- 

 dication of the several important deviations easily detected 

 by comparing text-figures 43 and 44. 



The length of the floor of the anterior nares is the element 

 producing the chief discrepancies between the curves in text- 

 ftgures 43 and 44, and, as indicated by a few of the lines 

 scattered throughout the latter, the floor of the anterior nares 

 is disproportionately long in some skulls and abnormally 

 short in others. Text-figure 47 gives the measurements for 

 a region almost corresponding to those above, that is, from 

 the anterior end of the internasal suture to the anterior 

 superior dental alveolus. These measurements range from 

 52 mm down to 14 mm, the extremes differing as 3.7 :1. A 

 comparison of text-figures 43 and 44, in conjunction with 47, 

 indicates that the length of floor of the anterior nares does 

 not directly follow the total muzzle length, but may show 

 independent variations. Thus text-figure 47 aids in an under- 

 standing of the small and irregular differences found between 

 the measurements of length from the auditory meatus to the 

 anterior end of the internasal suture and from the meatus 

 to the anterior superior dental alveolus. 



COMPARISONS OF MEASUREMENTS BETWEEN GIVEN POINTS 

 ALONG THE MID-DORSAL LINE or THE SKULL 



The sequence of skulls in these sagittal measurements was 

 arranged according to the distance from the bregma to the 

 nasion (pi. 35, fig. 3, C-D). These measurements range from 

 a longest of 82 mm down to a shortest of 31 mm, the extremes 

 differing as 2.66 :1. Text-figure 45 shows the first two measure- 

 ments at the left to be much greater than the third, but from' 

 there on a regular and gentle decline in the magnitudes of 

 this dimension is shown. 



