216 CRANIA AMERICANA. 



Internal capacity, . 

 Capacity of the anterior chamber. 

 Capacity of the posterior chamber. 

 Capacity of the coronal region. 

 Facial angle, .... 



75. cubic inches. 

 28. cubic inches. 

 47. cubic inches. 

 6.25 cubic inches. 

 66 degrees. 



Eight flattened skulls of the Columbia river tribes in my possession (seven 

 of which are figured in the preceding plates) give the following results of measure- 

 ment. 



Mean of the internal capacity, 80 cubic inches. 



Mean capacity of the anterior chamber, 31.8 cubic inches. 



Mean capacity of the posterior chamber, 46.8 cubic inches. 



Mean capacity of the coronal region, 11.8 cubic inches. 



Mean facial angle, 70 degrees. 



It therefore appears that the operation of flattening and otherwise distorting 

 the head in infancy by artificial contrivances, does not diminish the capacity of 

 the cranium, or the whole volume of brain ; neither does it materially affiect the 

 relative proportions of brain in the two chambers of the cranium, inasmuch as the 

 lateral expansion of the frontal region compensates for the loss of vertical diameter. 

 The coronal region, however, is very much reduced by the process, and the facial 

 angle is diminished at least five degrees. 



The external anatomical measurements are extremely distorted, especially 

 the several diameters, and the length of the head and face conjoined ; for example, 

 the eight crania give the following results : 



Mean longitudinal diameter, 6.7 inches. 



Mean parietal diameter, 6. inches. 



Mean frontal diameter, 4.9 inches. 



Mean vertical diameter, 4.8 inches. 



Mean of inter-mastoid arch, 14.6 inches. 



Mean of inter-mastoid line, 4.1 inches. 



Mean of occipito-frontal arch, 13.1 inches. 



Mean of horizontal periphery, 20. inches. 



Mean of extreme length of head and face, 8,3 inches. 



