232 NEW ZEALAND NATURE-STUDY BOOK 
how well it can see in the faint light of evening or even at 
night. 
The ears are large and movable, either together or 
separately. This enables them to be turned in any direc- 
tion, and so increases the power of hearing which, needless 
to say, is very acute. 
Fig. 135.—Lower part of fore- 
limb (side view). the body, the long can non- 
a, c2nnon-bone; b, splint-bone: 
¢, pastern bone; d, coronary bone : bone below the knee with its 
é, coffin bone. 
The sense of smell also is 
very keen. ‘To approach a horse 
unawares care must be taken to 
come up to it against the wind. 
The limbs are extremely 
characteristic, being sufficiently 
strong to support a heavy body, 
and at the same constructed 
for speed. The fore-limb con- 
sists of the humerus, buried in 
the body of the horse, the lower 
arm-bones fused together and 
having the elbow close up under 
two splint-bones, one at either 
side, and the three small bones at the 
bottom of the limb—the last of which 
carries the hoof. Comparing the fore 
limb of the Horse with the human 
arm—the similarity between the upper 
and lower arm-bones in each is ob- 
vious: the cannon bone corresponds 
to the middle metacarpal, or bone in 
the middle of the palm, and hence the 
knee joint of the Horse corresponds 
to the wrist. From this, it follows 
that the three lower bones in the limb, 
Fig. 136.—Lower part of 
fore-limb (front view). 
a, cannon-bone; b, splint- 
bone ; ¢c, three joints of foot. 
