"Of course it does, not only with animals, but with trees, plants, and even man, until he is accustomed to the change. With respect to animals, there are some which can bear the different varieties of climate, and even change of food. The horse, for instance, although originally indigenous to Arabia, lives as well in the Temperate, and even in the Frigid Zones it may be said, for they endure the hard winters of Russia and North America; so will domestic cattle, such as cows, sheep, pigs, &c. It is a curious fact that, during the winter in Canada, a large proportion of the food of cattle consists of fish." "Fish, papa! Cows eat fish?" "Yes, my dear boy, such is the fact. It is a remarkable instance of a graminivorous or grass-eating animal being changed for a time into a flesh-eating, or rather into fish-eating animal. But there are other animals which can live under any temperature, as the wolf, the fox, the hare, and rabbit. It is a curious provision, - that the sheep and goats in the hottest climates throw off their warm covering of wool, and retain little better than hair; while, removed to a cold climate, they recover their warm covering immediately." "But a goat has no wool, papa." "What are Cashmere shawls made of, William?" "Very true, papa." "Most animals have a certain increase of covering as they recede further from the warm climates to the cold ones. Wolves and foxes, hares and rabbits, change the colour of their skins to white when they get far north. The little English stoat, which is destroyed by the gamekeepers, becomes the beautiful snow-white ermine in Russia and other cold countries." "Well, papa, I think it a great advantage to man, and a proof of the Almighty's care of him and kindness to him, in permitting all the animals most useful to him to be able to live in any country; but I don't know whether I am wrong in saying so, papa: I cannot see why an animal like the wolf should not have been kept to his own climate, like the lion and tiger, and other ferocious animals." "You have started a question, William, which I am glad you have done, rather than it should have remained on your mind, and have puzzled you. It is true that the shepherd might agree with you, that the wolf is a nuisance; equally true that the husband man may exclaim, What is the good of thistles, and the various weeds which choke the soil? But, my dear boy, if they are not, which I think they are, for the benefit of man, at all events they are his doom for the first transgression. `Cursed is the ground for thy sake - thorns and thistles shall it bring forth to thee - and by the sweat of thy brow shalt thou eat bread,' was the Almighty's sentence; and it is only by labour that the husbandman can obtain his crops, and by watchfulness that the shepherd can guard his flocks. Labour is in itself a benefit: without exercise there would be no health, and without health there would be no enjoyment."