14 THE TONER LECTURES. 



lino-ual aspect of the ramus from the first m.olar to the canine tooth. 

 In the skull of a young adult the swelling was mammalated, each 

 nodule answering to the socket of a tooth. In the remaining bones 

 three in number, the swelling was uniformly convex, aud extended 

 to a line which was nearly equal to that of the bottoms of the 

 sockets. The bone constituting the swelling was firm in consist- 

 ence, but did not appear to be the result of inflammation. Out of 

 thirty-four Esquimaux crania in the Army Medical Museum the 

 hyperostosis was absent in one only. 



In the living subject the distance from the angle of the bone to 

 the firm muscle-mass about the cervical vertibrse often differs on 

 the two sides. It is commonly greater on the left side. When sep- 

 arated from the attachments and relations, the bone does not exhibit 

 the degree of asymmetry, which corresponds to the peculiarity named. 

 It is true the left ramus may be deflected slightly outward to corre- 

 spond w'ith the increase of left-sided deviation of the superior dental 

 arch, but no amount of dental variation could correlate with the 

 apparently gross change at the angle as is seen during life. The 

 explanation lies not in the maxillse, but in the cervical vertebrae, 

 especially the atlas, the left transverse process of which is the 

 smaller. 



The disposition for the left angle of the lower jaw to project to a 

 degree much greater than the angle of the right side has been found 

 by me to correspond also to the relation between the right and left 

 sides of the hyoid bone. In a word, the entire left greater cornu 

 deviates to a greater degree from the median line of the bone than 

 does the right. The same remark is applicable to the two sides of 

 the thyroid cartilage. These parts can be felt in the neck of the 

 living subject. I have notes of several cases in which an irritation 

 of the lower part of the pharynx appeared to be associated with the 

 pressure of the posterior free end of the right great cornu against 

 the mucous membrane. I have never detected similar points of 

 irritation on the left side. The tentative conclusion I have drawn 



