The quality of the horse’s vision differs from that of man. The former can take in a wider range in consequence of the lateral position of the eyes and their distance apart; and when the animal, with its head down, is quietly grazing, it can see objects with facility in every direction round it. Man’s vision is more limited in range, but it is probable more acute, because the black lining of the human eye renders it a more perfect camera obscura, and gives more vividness to the pictures formed within it. The lining membrane of the horse’s eye is of a beautiful sea green colour, in consequence of which it absorbs so much the less light, and thereby affords increased power of vision in the night. Every rider must be aware from experience that his horse can discern surrounding objects, when the gloom of evening conceals them from his own eyesight. All animals who have to seek their food by night have the interior of the eye more or less bright; in the wolf and the dog it is grey; and in all varieties of the cat species it is yellow; the eyes of the lion have been compared to two flaming torches in the night. There are individuals of the human race called Albinos, whose eyes look red like those of ferrets, from the absence of the usual black pigment, and these persons are almost blind by day, but see with ease in what to other men seems thick darkness. “Many persons erroneously suppose that the flow of tears, caused by bodily pain or emotions of the mind, is peculiar to man. But Shakspere says of the wounded stag:— “The big round tears Coursed one another down his innocent nose In piteous chase;” and horses are repeatedly seen to weep under acute pain or brutal usage. Mr. Lawrence, speaking of the cruelty exercised by some dealers in what they call “firing” a horse before he is led out for sale, in order to rouse every spark of mettle, says, “More than fifty years have passed away, and I have before eyes a poor mare stone blind, exquisitely shaped, and showing all the marks of high blood, whom I saw unmercifully cut with the whip a quarter of an hour before the sale, to bring her to the use of her stiffened limbs, _while the tears were trickling down her cheeks_.”