And now we have learned some of the most important ways in which the busy brook is toiling; but there are other points which we might have seen, and in some brooks there are special features to be noted. However, we have learned that the brook is no idler, that its main work is to conduct to the ocean the rain that falls upon the earth's surface, and that in doing this it is wearing down the hills, carrying them away only to build up in other places. The cheerful song of the brook takes on a new meaning as we lie in the shade and watch it hurry by. It is not the song of idleness nor of pleasure, but like the song with which a cheerful and tireless worker seeks to make its task lighter. LEAFLET XI. INSECT LIFE OF A BROOK.[13] BY MARY ROGERS MILLER. [13] Nature-Study Quarterly, No. 5: Leaflet 18, June, 1900. [Illustration] What wader, be he boy or water-fowl, has not watched the water-insects? How they dart hither and thither, some skimming the surface, others sturdily rowing about in the clear shallows! The sunlight fastens, for an instant, their grotesque reflections on the smooth bottom, then away--the shadow is lost, except for the picture it left in the memory of the onlooker. The splashing, dashing wader, with his shout and his all-disturbing stick, stands but a poor chance of making intimate acquaintances among water-folk. Your true brook-lover is a quiet individual except when occasion demands action. The lad who, from the vantage ground of a fallen log or overhanging bank, looks down on the housekeeping affairs of his tiny neighbors has the right spirit. Indeed, I doubt whether these little folk are aware of his presence or curiosity. Time was when the enjoyment of brook-life was limited to boys. White aprons, dainty slippers and fear of being called "Tom-boy" restrained the natural impulses of the "little women." Happily that day is past, and it no longer looks queer for girls to live in the open air and sunshine, free to chase butterflies and hunt water-bugs with their brothers. My brooks abound in swift eddies, perfect whirlpools in miniature, and water-falls of assorted sizes. They have also their quiet reaches, where whirligig beetles perform their marvelous gyrations, and bright-eyed polliwogs twirl their tails in early May. On the banks are ferns and mosses; sometimes willows and alders form a fringing border.