GENETIC TYPE AND THE ENDOCRIXES 



169 



heights, the distance from auditory meatus to bregma, but 

 the top of the graph for frontal widths forms a broken and 

 irregular curve quite out of accord with that for cranial 

 height. Thus the least frontal width of a high cranium may 

 be either wide or narrow. 



The least frontal width of the cranium as related to length 

 of total skull base. As shown in text-figure 18, the least 

 frontal measurements were arranged in sequence from widest 

 to narrowest, the range of measurements being from 49 mm 

 to 27 mm or as 7 :4. 



/o 



Text-figure 18. Sequence E. Least frontal width. Group of seventy skulls 

 arranged in sequence from widest to narrowest least frontal measurement. 



The lengths of the total skull base, from the posterior edge 

 of the occipital to the anterior lingual alveolus along a median 

 line (pi. 35, fig. 2, D-G) were arranged in text-figure 19 in 

 comparable sequence to the above. These measurements range 

 from 210 mm down to 67 mm, the length of the longest skull 

 being more than three times that of the shortest. A com- 

 parison of the two charts clearly indicates that in the dif- 

 ferent dog breeds there is no correlation whatever between 

 cranial width in the frontal region and skull length. 



Thus far we have found that not all measurements of 

 widths in various skull regions are correlated, and also that 

 some widths are not directly increased with an increase in 



