There will be sticklebacks in your brook, but the other fishes do not like them, for they are tough and dry of flesh, and their sharp spines make them hard to swallow and harder still to digest. They hide beneath the overhanging tufts of grass, and dart out swiftly at whatever passes by. They tear the fins of the minnows, rob the nests of the sunfish, drag out the eggs of the suckers, and are busy from morn to night at whatever mischief is possible in the brook. The male dresses in jet-black when the breeding season is on, sometimes with a further ornament of copper-red or of scarlet. The sticklebacks build nests in which to hide their eggs, and over these the male stands guard, defending them with courage which would be dauntless in any animal more than two inches long. Very often he has to repel the attacks of the female herself, who, being relieved of all responsibility for her offspring, is prone to turn cannibal. Even the little dwellers of the brook have their own troubles and adversities and perversities. Last of all comes the blob, or miller's thumb, who hides in darkness and picks up all that there is left. He is scaleless and slippery, large of head, plump of body, and with no end of appetite. He lurks under stones when the water is cold. He is gray and greenish, like the bottom in color. He robs the buried nests of eggs, swallows the young fishes, devours the dead ones, and checks the undue increase of all, not forgetting his own kind. When he has done his work and the fall has come and gone, and the winter and the spring return, the brook once more fills with fishes, and there are the same kinds, with the same actions, the same ways, and the same numbers, and one might think from year to year, as the sun is said to do, that these were the selfsame waters and the selfsame fishes mating over and over again and feeding on the selfsame food. But this is not so. The old stage remains, or seems to remain, but every year come new actors, and the lines which they repeat were "written for them centuries before they were born." But each generation which passes changes their lives just a little, just as the brook and the meadow itself is changing. WHITE WHALES IN CONFINEMENT. BY FRED MATHER. The dolphin family (_Delphinidæ_) contains nine genera, with only one species in each, but the most interesting one is the white whale (_Delphinapterus leucas_ of Pallas, or _D. catodon_ [Linn.] of Gill), because it is the only one that can be kept in confinement and its habits observed under semi-domestication. It has fallen to my lot to care for several of these animals in confinement, and to have a chance to note their peculiarities.