901 



5851. (15.) The back part of the left ramus of the same lower jaw. It shows the 

 widely open alveolus of the first true molar, the crown of which is there 

 exposed ; and the formative socket of the second true molar. 



5852. (15-) The right ramus of the lower jaw of a Child. 



The deciduous series, viz. two incisors, a canine, and two molars, are in place : the formative 

 sockets of the successional teeth and of the first and second true molars are exposed from the 

 inner side. The matrices of the second bicuspid and second true molar had not begun to be 

 calcified. 



5853. The left rami of four lower jaws, of Individuals at different periods of life. 



The youngest shows the five deciduous teeth in place : the next shows the two permanent 

 incisors, the deciduous molars, and first true molar ; the second true molar rising into place, 

 and the permanent canine exposed in its formative socket : the third shows the permanent 

 incisors, canine, bicuspids, and first and second true molars in place, all the deciduous teeth 

 having been shed : the fourth shows the full permanent series. 



These specimens are the subjects of fig. 2. pi. xvi. Op. cit., where they are represented 

 larger than natural, and are thus described : " Fig. 2. Four Lower-jaws at different periods 

 of life, from the age when the five shedding teeth are completely formed, to that of a com- 

 plete set. This figure shows four things : 1 . The lengthening of the jaw backwards, which 

 is seen by the oblique line made by the four condyles ; 2. The gradual rise of the two pro- 

 cesses above the line of the teeth ; 3. The gradual increase of the teeth in proportion as the 

 jaw lengthens ; And, 4. The part formed, always keeping the same size." 



5854. Sections of the right halves of the upper and lower jaws, with the outer 

 alveolar wall removed to expose the implanted roots of the teeth. 



This specimen is the subject of fig. 1. pi. vi. Op. cit., in the description of which Hunter 

 remarks : "The length of each fang is at once seen with respect to its neighbour, and this 

 kind of articulation " (gomphosis) " pointed out at one view." 



5855. The left upper maxillary bone, in which the canine is exposed in its socket, 

 the crown not having been protruded beyond the opening of the sockets of the 

 contiguous teeth. 



This specimen is the subject of fig. 8. pi. viii. Op. cit., and is described as follows : "A 

 sketch of an Upper-jaw where the Cuspidatiis of that side had been formed high up in the 

 .Jaw, and, therefore, never would appear through the Gum." 



