THE GREASE. 77 



refractions which would arise from its irregu- 

 larity. 



As the body is thus defended with hair, it 

 accordingly follows that those parts which would 

 if they were naked, be most exposed to water 

 and dirt, are furnished with a greater portion of 

 this covering. Hence the hair on the lower 

 part of the leg is considerably longer than else- 

 where. This is sufficiently manifest in horses 

 which are bred in cold marshy soils, such as 

 Holland, Flanders, and many parts of England. 



If a leg of this description, with the hair 

 on it in its natural state, is examined after pas- 

 sing through the dirtiest roads for several hours, 

 when the hair is divided by the hand to inspect 

 the skin, it will be found that tlie external part 

 only is wet, whilst the internal part, together 

 with the skin, will have remained perfectly dry 

 and free from dirt. In this state it will be only 

 necessary to wash the dirt off the hair on the 



outside. 



