GENETIC TYPE AND THE ENDOCRINES 



175 



surface to the anterior end of the mandibular symphysis was 

 measured. The range of these mandibular lengths is from 

 198 mm to 62 mm or as 3.2:1. These lengths, although agree- 

 ing in general with the above three dimensions, show violent 

 individual deviations which are due to the presence of the 

 bulldog skulls with their extremely shortened maxillary and 

 nasal regions. 



The fifth series of measurements in this sequence repre- 

 sents the maxillary premolar regions, the distance from the 



60 



So 



3o 

 Zo - 

 /o 



Text-figure 24. Sequence F. Maxillary premolar region. Same skull sequence 

 as text-figure 20. 



posterior tip of the canine alveolus to the posterior border 

 of the fourth premolar tooth (pi. 35, fig. 3, G-H). These 

 distances range from 67 mm to 16 mm (text-fig. 24), the 

 extremes differing as 4.2 : 1. The slope formed by the measure- 

 ments in this chart follows very closely those for palatal 

 length, length of muzzle from inf raorbital foramen and length 

 of internasal suture, but here again are individual disagree- 

 ments with mandibular lengths. 



