. Plant studies; an elementary botany. Botany. FOLIAGE LEAVES: FUNCTION, STRUCTURE, ETC. 87 support and conduction are very perfect (see Fig. 27). It is also clear that the green substance thus supported and supplied with material is the important part of the leaf, the part that demands the light-relation. Study the various plans of the vein systems in Figs. 3, 9, 13, 18, 19, 20, 21, 25, 26, 51, 70, 75, 82, 83, 92. Fig. 27. A plant (Fittonia) whose leaves show a network of veins, and also an adjust- ment to one another to form a mosaic. 30. Epidermis.—If a thick leaf be taken, such as th
. Plant studies; an elementary botany. Botany. FOLIAGE LEAVES: FUNCTION, STRUCTURE, ETC. 87 support and conduction are very perfect (see Fig. 27). It is also clear that the green substance thus supported and supplied with material is the important part of the leaf, the part that demands the light-relation. Study the various plans of the vein systems in Figs. 3, 9, 13, 18, 19, 20, 21, 25, 26, 51, 70, 75, 82, 83, 92. Fig. 27. A plant (Fittonia) whose leaves show a network of veins, and also an adjust- ment to one another to form a mosaic. 30. Epidermis.—If a thick leaf be taken, such as that of a hyacinth, it will be found possible to peel off from its surface a delicate transparent skin {epidermis). This epidermis completely covers the leaf, and generally shows no green color. It is a protective covering, but at the same time it must not completely shut off the green substance beneath from the outside. It is found, therefore, that three important parts of an ordinary foliage leaf are : (1). 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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