. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. 700 Handbook oj Nature-Study nothing but "trimming," they are so purely ornamental. Each little cup or socket, of the joint or node, in branch or stem, has a row of points around its margin, and these points are terminals of the angles in the branch. If a branch is triangular in cross section, it will have three points at its socket, if quadrangular it will have four points, and the main stem may have six or a dozen, or even more points. The main stem and branches are made u
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. Handbook of nature-study for teachers and parents, based on the Cornell nature-study leaflets. Nature study. 700 Handbook oj Nature-Study nothing but "trimming, " they are so purely ornamental. Each little cup or socket, of the joint or node, in branch or stem, has a row of points around its margin, and these points are terminals of the angles in the branch. If a branch is triangular in cross section, it will have three points at its socket, if quadrangular it will have four points, and the main stem may have six or a dozen, or even more points. The main stem and branches are made up entirely of these seg- ments, each set at its lower end in the socket of the segment be- hind or below it. These green branches, rich in chlorophyl, manufacture for the plant all the food that it needs. Late in the season this food is stored in the rootstocks, so that early next spring the fertile plants, nour- ished by this stored material, are able to push forth before most other plants, and thus develop their spores early in the season. There is a prothallium stage as in the ferns. Above where the whorl of stems comes from the main branch, may be seen a row of upward-standing points which are the remnants of leaves; each branch as it leaves the stem is set in a little dark cup with a toothed rim. There is a nice gradation from the stout lower part of the stem to the tip, which is as deli- cate as one of the side branches. The rootstock dies out behind the plant and pushes on ahead like the rootstock of ferns. The true roots may be seen attached on the under side. The food made in the summer is stored in little tubers, which may be seen in the rootstocks.. The sterile plant of the field horsetail, one-hat} natural size. LESSON CLXXVII The Field Horsetail The Fertile Plant Leading thought—The horsetail is a plant that develops spores instead of seeds, and has green stems instead of leaves. Method—In April and May, when the children are looking for flowers, they will find