20 



EVENINGS AT THE MICROSCOPE 



amples, in which we shall find it still more strongly de- 

 veloped, in conjunction with some other peculiarities. 

 All the hairs that we have looked at are what I have 

 called fibrous in their interior texture, but those of many 

 animals are more distinctly cellular. 



Thus, in these specimens, plucked from the fur of the 

 Cat that lies coiled up on the hearth-rug, we see, first, that 

 the imbrications are short, being about equal to the dium- 



FIBRE OF SHEEP'S WOOL. 



HAIR OF CAT. 



HAIRS OF MOLE. 



eter in length, but are very strongly marked ; though, like 

 those of the Sheep's wool, obtuse. Hence, the contour 

 is extremely like that of the stipe of an old rough palm- 

 tree. There is a distinct bark (cortex), which is thick, and 

 marked with longitudinal lines, which add to the resem- 

 blance just alluded to. The interior is clear, marked off 

 at pretty regular intervals by the broad flattened medul- 

 lary cells, in single series, each cell occupying, for the 

 most part, the whole breadth of the interior. These cells 



