In about a year it began to look dingy; and blackening each succeeding year, it became coal-black at the end of four. Its chief food was hemp seed. Such influence has food on the color of animals! Darwin, in his Voyage, says that the wild cattle in East Falkland Island, originally the same stock, differ much in color; and that in different parts of that one small island, different colors predominate. He remarked that the difference in the prevailing colors was so obvious, that in looking at the herds from a point near Point Pleasant, they appeared from a long distance like black spots, whilst south of Choiseul Sound they appeared like white spots on the hill-sides. Round Mount Usborne, at a height of one thousand to fifteen hundred feet above the sea, about half of some of the herds are mouse or lead colored. "From the westward till you get to the river Adur," observed White, "all the flocks have horns and smooth white faces, and white legs, and a hornless sheep is rarely to be seen; but as soon as you pass that river eastward, and mount Beeding Hill, all the flocks at once become hornless, or, as they call them, poll-sheep; and have, moreover, black faces, with a white tuft of wool on their foreheads, and speckled and spotted legs, so that you would think that the flocks of Laban were pasturing on one side of the stream, and the variegated breed of his son-in-law, Jacob, were cantoned along on the other." Youatt speaks of two flocks of Leicester sheep which have been purely bred from the original stock of Mr. Bakewell for more than fifty years. There is not a suspicion existing in the mind of any one at all acquainted with the subject, that the owner of either of them has deviated in any one instance from the pure blood of Mr. Bakewell's flock, and yet the difference between the sheep possessed by these two gentlemen is so great that they have the appearance of being quite different varieties. "We may, in truth," said Voltaire, "be naturally and aptly resembled to a river, all whose waters pass away in perpetual change and flow. It is the same river as to its bed, its banks, its source, its mouth, everything, in short, that is not itself; but changing every moment its water, which constitutes its very being, it has no identity; there is no sameness belonging to the river." Said Sir Kenelm Digby, long before Voltaire, "There is not one drop of the same water in the Thames that ran down by Whitehall yesternight; yet no man will deny but that it is the same river that was in Queen Elizabeth's time, as long as it is supplied from the same common stock, the sea."