. Nature study and agriculture. Nature study; Agriculture. S6 NATURE STUDY AND AGRICULTURE helps to make its leaf different from the leaves of other species. Form and Size. — The shape of leaves varies from that of the needles of the pine and the narrow blade of grass to the circular leaf of a water lily and garden nasturtium, with an infinite number of intermediate gradations. A few of the typical forms are shown in the accompanying figures. Stu- dents of botany sometimes learn the names of a large num- ber of these shapes, but that is not necessary for our purpose.. Leaves Indian corn, showi
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. Nature study and agriculture. Nature study; Agriculture. S6 NATURE STUDY AND AGRICULTURE helps to make its leaf different from the leaves of other species. Form and Size. — The shape of leaves varies from that of the needles of the pine and the narrow blade of grass to the circular leaf of a water lily and garden nasturtium, with an infinite number of intermediate gradations. A few of the typical forms are shown in the accompanying figures. Stu- dents of botany sometimes learn the names of a large num- ber of these shapes, but that is not necessary for our purpose.. Leaves Indian corn, showing parallel veins. Basswood, showing netted veins. We merely wish to urge the reader to observe the shape and size of the leaves carefully so that the mental picture thus formed may aid him in distinguishing one plant from another. The Margin of the Leaf. — This may be an even hne, or it may be toothed, or wavy; there may be deep notches or indentations that cut the leaf into great lobes, or these notches may extend clear down to the midrib and make those lobes look like separate leaves. In the last case we have Compound Leaves. — In these, the blade of the leaf has several entirely separate parts, each joined to the main leaf-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Schmidt, Charles Christian, 1859-. Boston, New York [etc. ] D. C. Heath & Co