366 



Proceedings of the 



a 



Fig. 4. 



Dr Inman says :* " In the deer the cells are so numerous as 

 to occupy the whole of the body of the hair, and so irregular 

 that no particular place of subdivision can be traced ;" and his 

 figure quite corresponds with this, the cells being there shown 

 as amorphous ; but it will be seen from the above figure that 

 they are truly polygonal — for the most part hexagonal, and 

 there are very distinct septa and lines of separation. In fact, 

 as Dr Greville pointed out to me, one of the most striking 

 points in this structure is its close resemblance to (I might al- 

 most say identity with) polygonal cellular tissue seen in the 

 hairs and other parts of plants. 



The difference between the long and thick hairs, and the 

 fine small hairs, is interesting and suggestive. We have here 

 types of the two great sections into which hair may be divided 

 growing side by side ; the one wholly cellular, the other appa- 

 rently without cells at all, and wholly horny and cortical. I 

 do not doubt that, by the use of proper agents, we would find 

 that the latter has a central cellular medulla or pith, as in the 



* Loc cit., p. 



