You should notice, too, whether both jaws are
						soft or hard, or only one; for horses with unequal jaws are generally
						unequally sensitive in the mouth. A prominent eye looks more alert than one that
						is hollow, and, apart from that, it gives the horse a greater range of
						vision. And wide open nostrils afford room for freer breathing than close ones, and
						at the same time make the horse look fiercer, for whenever a horse is angry
						with another or gets excited under his rider, he dilates his nostrils.