624 



THE EXTERIOR OF THE HORSE. 



directions, and upon which are outlined in relief the zones of enamel of which 

 we have spoken in connection with the structure of the teeth. 



1 2 3 



Fig. 294.— The three inferior deciduous molars (right side). 

 FI. Internal face. | FE. External face. 



The following are the dimensions of the molars of the first dentition : * 



(a) Thickness from without to within, measured in the middle portion : 



Inferior. Superior. 



1st 0.009 m. 0.021 m. 



2d 0.010 m. 0.020 m. 



3d 0.012 m. 0.022 m. 



(6) Length from before to behind : 



Inferior. Superior. 



Isl 0.035 m. 0.043 m. 



-<^ 0.032 m. 0.033 m. 



3d 0.039 m. 0.035 m. 



1 We only cite these dimensions to give a general idea of them. It is evident that they are 

 subject to variation ; but as all our figures are taken from the same animal, it will be known 

 what relations exist among the teeth themselves. 



