. Nature and development of plants. Botany. NATURE OF PLANTS 31 or the water beech {Carpinus) and the beech, noting how the leaves of one fit when placed upon the branch of the other. This subject of leaf form and arrangement may be summed up by the statement that these features are devices for exposing the maximum leaf surface without one leaf interfering with another. This is in accord with the fact that light is practically of no value in photosynthesis after passing through two leaves. Another interesting feature about the leaf is its relation to the. Fig. 18. Fig. 19. Fig. 18. Leaves of r
. Nature and development of plants. Botany. NATURE OF PLANTS 31 or the water beech {Carpinus) and the beech, noting how the leaves of one fit when placed upon the branch of the other. This subject of leaf form and arrangement may be summed up by the statement that these features are devices for exposing the maximum leaf surface without one leaf interfering with another. This is in accord with the fact that light is practically of no value in photosynthesis after passing through two leaves. Another interesting feature about the leaf is its relation to the. Fig. 18. Fig. 19. Fig. 18. Leaves of red oak: A, sunned leaf. B, shaded leaf. Fig. 19. Compound leaves: A, red ash. B, horse chestnut. intensities of light. Some plants demand the full intensities of sunlight while others can tolerate only a small fraction of it. Some lichens will grow in a light only 1/156 part of the full in- tensity while many plants, as the grasses, will endure the strongest illumination. Beech, maple and spruce are tolerant of shade and oak, hickory and chestnut are intolerant. This relation of plants to light is an important factor in controlling their associations and we frequently .speak of plants as sun loving, partially so, shade, and deep shade plants. The coloration of leaves is often of significance. In addition to the green color, of which we now have some understanding,. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
