HAIR OP BAT AND MOUSE. 13 



the mice are of that chisel-shaped character found in 

 the rabbit and other rodent animals. 



Now if we turn to the fur, and examine it with a 

 microscope, we shall there find characteristics as 

 decided as those of the teeth. 



On this page is the magnified image of a single 

 hair, taken from the long-eared bat. It will be 

 seen that the outline of the hair is deeply cut, and 

 the markings run in a double line. These markings 

 and outlines are caused by the structure of the hair, 

 which is covered with a regular series of scales 

 adhering but loosely to its exterior. These scales 



can be removed by rough handling, and therefore the 

 aspect of the hair can be much altered. 



Let us now take a hair from the common mouse, 

 and place it under the microscope. This being done, 

 we find the result to be as shown in the accompany- 

 ing cut. 



The two objects here shown are two portions of 

 the same hair ; the upper one showing the middle 

 of the hair, and the lower being taken from a portion 

 nearer the root. Both these specimens were taken 



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