30 



DESCRIPTION OF THE PLATES. 



showing the secondary undulations, the 

 walls, and the disgregated arrangement 

 of their calcareous contents, which give 

 them the appearance of beaded fibres. 

 Ret 2 ius. Fig. 7. Transverse section of 

 the matrix of a canine tooth of the 

 foetus of a Dog ; viewed by reflected light 

 on a dark ground ; c, capsule ; i, space 

 filled by the fluid blastema of enamel- 

 pulp ; e, actinenchyma and internal 

 stratum of cylindrical cells of enamel- 

 pulp ; i, interspace between enamel and 

 dentinal pulp ; p, external or preformative 

 membrane of dentinal pulp ; d, dentinal 

 pulp ; Purkinje. Fig. 7. Matrix of the 

 tooth of a fcetal calf at the nineteenth 

 week ; v, vascular basis of dentiparous 

 grove from which is developed d the 

 dental papilla or pulp ; it is covered, as 

 with a cap, t>y e the semifluid enamel- 

 pulp ; and this is developed from the 

 inner surface of c the capsule ; to the 

 summit of which adheres, g, a portion of 

 the gum, characterized by the epithelial 

 cells, which M. Serres has described as 

 the glands which secrete the tartar of the 

 teeth. Fig. 8. Matrix of an incisor of 

 a nearly mature fcetal dog ; c, capsule ; 

 d, dentinal pulp with its summit calcified 

 and forming a cap of dentine ; e, enamel- 

 pulp ; i, fluid part of enamel-pulp, next 

 the capsule. Fig. 9. Part of a trans- 

 verse section of the coronal end of the 

 matrix of a molar of a fcetal Calf; 



c, capsule ; e, actinenchymatous part of 

 enamel-pulp ; e\ elongated cylindrical 

 cells of enamel-pulp ; next the dentine ; 



d, dentinal pulp ; d\ calcified portions of 

 the same. Purkinje and Rashkow. 



PLATE 123. 



Fig. 1. — Part of a longitudinal section of a 

 Human Incisor, magnified 230 linear 



dimensions, as seen by transmitted light. 

 t, Dentinal tubes ; d., dentinal cells; d", 

 terminal opake cellules close to the pitted 

 surface of the dentine for the attachment 

 of e e, the enamel. Fig. 2. Portions of 

 fibres of newly-formed enamel, with in- 

 termediate cell-membrane ; and the marks 

 e e, on the membrane covering the cal- 

 cified parts of the cells. Original. 



PLATE 124. 



A longitudinal section of an imperfect bi- 

 cuspis, developed, with hair, in a cyst of 

 the human ovarium. *Nat. size ; d, den- 

 tine; e, enamel ; o, osteo- dentine : v, pubp- 

 cavity ; c, cement, passing into b, bone, 

 uniting the fang with d part of the den- 

 tine of another tooth. Original. 



PLATE 125. 



Fig. 1 . — Upper and lower incisors and 

 outlines of canines, \ nat. size, Wolf 

 (Canis Lupus). Fig. 2. Upper and lower 

 canines and molars, \ nat. size, Wolf. 

 Fig. 3. Crowns of three last teeth, or true 

 molars, lower jaw, \ nat. size, Wolf. 

 Fig. 4. Deciduous and permanent series 

 of teeth, young Dog, from the inside, nat. 

 size. Fig. 5. Crowns of teeth of left side 

 of upper jaw of the long-eared Fox {Me- 

 galotis). Fig. 6. Upper and lower teeth, 

 left side, of the Proteles Lalandii, d 2 and 

 d 3, deciduous molars. De Blainville and 

 Rousseau. 

 In this and all the succeeding plates, the 



following letters and numerals signify the 



same teeth. 



i, incisor, 1 the first or mid-incisor, 2 the 

 second, 3 the third or outer incisor. In 

 some Plates the deciduous incisors are 

 marked d i. c, canine, p, premolars, 1, 

 first or foremost, 2 second, 3 third, 



