With age the habits of the trout change. When young they associate in schools and play together constantly, usually choosing parts of the brook where the bottom is muddy, in which, if startled suddenly, they bury themselves for safety. This does not often occur, however, as they prefer any little projection that juts out over the water where they can hide until the danger is past. As they grow older they separate, and each one chooses his own particular hiding-place, the larger trout taking the deepest holes and largest projections and leaving the smaller relations to shift for themselves. The older they grow the wiser and more wary they become, hence the necessity of considerable skill to land a wary old trout. Angle-worms are considered the best bait for trout, but in the spring, after the usual freshets, which wash vast numbers of worms and insects into the water, they bite better at the more tempting bait of a fly. Practice alone will enable one to catch this wary beauty. One must know not only how to catch it but where to find it, and some knowledge of entomology is essential at the very beginning. It is desirable to have some acquaintance with the insects that live in the water, under the water, and over the water, and whose habits in great part influence the movements of the fish. Miss Sara J. McBride, an accomplished naturalist of Mumford, New York, in an essay published some years ago in the _Forest and Stream_, taught the lesson of entomology we have referred to, as applied to the angler's purposes, in the following words: