24 THE SHEEP AND ITS COUSINS 



ably, completed by the end of the second year, 

 although the change of the front teeth is not 

 finished till considerably later. 



The second pair of permanent lower incisors, 

 for instance, pushes out the corresponding deciduous 

 teeth during the third year, while the third or outer- 

 most pair usually comes into place during the first 

 half of the fourth year, but the permanent lower 

 canines are not in use until the fifth year ; their 

 appearance indicating the completion of the adult 

 dentition. It should be added that the last pair 

 of molars in each jaw (of which the lower pair 

 consists of three-lobed teeth like the last lower 

 milk-molars) begin to develop roots at the base of 

 their crowns during the fourth year, after which 

 they cease to grow ; the same development having 

 taken place in the first and second pairs at an 

 earlier date. 



Wild sheep of all kinds are clothed with a 

 hairy coat comparable to that of cattle and ante- 

 lopes, but at the base of this fur there may be 

 more or less marked traces of a soft under-fur, 

 which is much more developed in some kinds of 

 wild goats ; this being known in Tibet and 

 Kashmir as pashm. Many tropical breeds of 

 domesticated sheep retain a hairy coat compar- 

 able to that of the wild sheep ; but in other 

 breeds, especially those inhabiting temperate and 

 cold climates, this is more or less completely re- 



