[Illustration: GREENLAND WHALE. (Balaena mysticetus).] THE GREENLAND WHALE. (_Balaena mysticetus._) The whale is by far the largest animal on earth, some species being many times the size of an elephant, and is it not a curious fact that in appearance it so resembles a fish that many suppose it to belong to that class, while truly it is not a fish at all? It is in reality much more like a cow or a horse, although externally it seems very unlike these animals; but appearances are not always to be relied upon. When we examine the construction of the whale we find that it is warm-blooded, as we are. We find that it has immense lungs which hold a great quantity of air and that it must fill them or die. We find that it has bones similar to those of land animals. It has the seven neck bones found in all mammals, but it is the opposite extreme from the giraffe, as in proportion to its size it has the shortest neck of any mammal, while the giraffe has the longest. It has ribs, also bones for the forearm, and, nearly obliterated, there are found bones representing the hind legs. Instead of being hatched from an egg, as most fishes are, a baby whale comes into the world alive and complete, and for many months it takes its mother’s milk as a calf might do or a young colt. A baby whale is indeed a monstrous infant, being sometimes ten or twelve or even fifteen feet long; but by its mother’s side it does not seem such a monstrosity, for the whale mother may be forty-five or fifty feet in length herself. These great animals are a most interesting study, for their ancestors undoubtedly once lived on land. We can imagine the land animal, many centuries ago, dwelling on the banks of some large stream, fond of spending much time in the water, until with successive generations the shape of the animal gradually changed and adapted itself to its fluid surroundings. The forearms and hands gradually became covered with continuous skin until the arm and hand became a flipper; the rear limbs grew shorter and snorter as they were used less and less, until finally there was nothing left to indicate their presence except a few small bones. The tail, used as a propeller, grew strong, large and flat, and we can imagine that the animals themselves, as they put out to sea and in time avoided even the rivers, became larger as the centuries passed by. However this may be, the Greenland Whale has been found sixty feet in length, although some other species are smaller.