II ON ANIMAL LIFE 47 
much, are, says Flower,’ “composed of exactly 
the same number 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. 
