GENETIC TYPE AND THE ENDOCRIXES 



205 



The four maxillary premolar teeth were measured for 

 greatest anteroposterior width of crown, and the sum of 

 the widths is represented for each skull by the lines in text- 

 figure 50. The sequence in this figure is the same as that 

 for the skull base. 



60 ■ 

 So- 



¥0 

 3o 

 Zo 

 /o- 



Text- 



_ are 50. Sequence N. Sum of the anteroposterior dimensions of the 

 maxillary premolar teeth. Same skull sequence as text-figure 49. 



The range of total premolar measurements is from 59 mm 

 down to 25 mm, the extremes differing as 2.4 :1. A comparison 

 of text-figures 49 and 50 shows no detailed exactness in cor- 

 respondence of length of skull and size of teeth, but there 

 is indication of a general though irregular agreement which 

 is probably due to a large extent to size differences among 

 the skulls. 



Resume of Deductions from Linear Measurements 

 Made on Different Skull Types 



From the foregoing rather comprehensive survey of linear 

 measurements on a group of dog skulls which included a 

 wide range of differences in size and type, we may make the 

 following deductions. 



