GENETIC TYPE AND THE ENDOCRINES 181 



than is the curve for premolar regions. Some short jaws 

 have teeth of large anteroposterior dimensions owing to the 

 fact that although the jaw itself is short it may be possessed 

 by a large dog. 



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Text-figure 30. Sequence H. Mandibular premolar region. Same skull sequence 

 as text-figure 28. 



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Text-figure 31. Sequence H. Sum of the anteroposterior dimensions of the 

 mandibular premolar teeth. Same skull sequence as text-figure 28. 



There is a general trend of agreement among the different 

 dimensions of the dog's mandible, but sharp individual ex- 

 ceptions occur in the jaws of the bulldog-like breeds. 



