11 ON ANIMAL LIFE 47 



much, are, says Flower,^ " composed of exactly 

 the same mimber of bones, having the same 

 general arrangement and relation to each 

 other. Not only the individual bones, but 

 every ridge and surface for the attachment of 

 muscles, and every hole for the passage of 

 artery or nerve, seen in the one can be traced 

 in the other." It is often said that the 

 Horse presents a remarkable peculiarity in 

 that the canine teeth grow but once. There 

 are, however, in most Horses certain spicules 

 or minute points which are shed before the 

 appearance of the permanent canines, and 

 which are probably the last remnants of the 

 true milk canines. 



The foot is reduced to a single toe, repre- 

 senting the third digit, but the second and 

 fourth, though rudimentary, are represented 

 by the splint bones ; while the foot also con- 

 tains traces of several muscles, originally 

 belonging to the toes which have now disap- 

 peared, and which " linger as it were behind, 

 with new relations and uses, sometimes in 

 a reduced, and almost, if not quite, function- 



1 The Horse. 



