304 



ANTHROPOLOGICAL SURVEY IN ALASKA 



[ETH. ANN. -1G 



Additional Measurements on the Lower Jaw 

 MALE 



FEMALE 



Western Eskimo 



Florida Indian 



Louisiana Indian 



Arkansas Indian 



Kentucky Indian 



U. S. whites (miscellaneous) . 



(230) (228) 

 9. 61 9. 60 



(100) 

 7.47 



(19) 

 7.72 



(16) 

 7.38 



(57) 

 7.46 



(30) 

 7. 12 



(20) 

 7.02 



(134) 



61 



(18) 

 6.02 



(15) 

 5.77 



(52) 

 5.85 



(25) 

 5.64 



(20) 

 5.87 



(128) 

 5.57 



(199) 

 10. 57 



(17) 

 9.70 



(15) 

 9.90 



(56) 

 9.58 



(30) 

 9.45 



(20) 

 9. 12 



1 Sliding calipers : Separate measurement of each half of the body, from the lowest point 

 on the posterior border of each ramus not affected by the angle to a point of corresponding 

 height on the line of the symphysis. The anterior point may, in consequence of a lower 

 or higher location of the posterior point, range from the chin to above the middle of the 

 symphysis, but the results are much alike. The measurement leaves much to be desired, 

 but Is the best possible if the two halves of the body are to be measured separately. 



2 The length of the whole jaw is measured on Broca's mandibular goniometer, by laying 

 the jaw firmly on the board, applying the movable plane to both rami, and recording the 

 distance of the most anterior point of the chin from the base of the oblique plane. This 

 measurement is easier than the previous, though on account of the variation in the angles 

 and the lower part of the posterior border of the rami it is also not fully satisfactory, and 

 it does not show the differences in the two halves of the body. 



3 Sliding calipers : One branch applied so that it touches the highest points on both the 

 condyle and the coronoid, while the other is applied to the lowest point of the ramus 

 anterior to the angle, if the bone here is prominent ; if receding, the branch of the compass 

 is applied to the midpoint on the lower border of the ramus. 



1 Sliding calipers : Maximum external diameter at the angles ; the maximum points may, 

 exceptionally, be either anterior to or a little above the angle proper. 



