GENETIC TYPE AND THE ENDOCRINES 



183 



of the entire skull base, the palatal process of the palate 

 bone may form a smaller fraction of the total palate than 

 it does in skulls where the proportion of total palate to 

 total skull base is lower. In other words, skulls with long- 

 muzzles and long palates receive a proportionally greater 

 contribution of palatal plate from the maxilla than do those 

 with short muzzles and short palates, or, to state it still 

 another way, variations in palatal length are principally due 

 to variations in maxillary contribution, since the contribution 

 to the total palate from the palate bone itself is comparatively 

 uniform in all types of dog skulls of a common size. 



Ifo 



3o 



to 



10 



Text-figure 33. Sequence I. Proportional percentage of length of the palatal 

 processes to the total length of palate bone. Same skull sequence as text-figure 32. 



The percentage of palatal processes of the palatal bone to 

 the total palate length ranges from 44 per cent down to 28 per 

 cent, that is, from a little less than half to a little more than 

 one quarter of the entire palate. The proportions of palatal 

 process length to entire palate length are highest in the skulls 

 represented to the right in text-figure 33; these proportions 

 are for the same skulls having the smallest proportion of 

 palate to total skull base, as indicated in text-figure 32. 



The above relations are somewhat more clearly illustrated 

 by text-figure 34 (fig. 1). The numbers along the vertical 

 line give the percentage of palatal process contributed by 

 the palate bone to the total hard palate and those along the 



