. Our field and forest trees. Trees. About Green Leaves 199 chokes the little mouths, transpiration is stopped, and the tree's work comes to a standstill. Hence, most leaves are so made that they can shed water like new umbrellas. Sometimes the leaf-skin is so smooth that water runs off it — as it does from polished tiling. Sometimes it is waxed, so that it can shed the rain drops, and often it contains a substance called " cutin," which makes it waterproof. On many trees, rain drips from leaf-point to leaf-point, and is. Fig. SI. Part of the upper surface of a leaf, showing one of t
. Our field and forest trees. Trees. About Green Leaves 199 chokes the little mouths, transpiration is stopped, and the tree's work comes to a standstill. Hence, most leaves are so made that they can shed water like new umbrellas. Sometimes the leaf-skin is so smooth that water runs off it — as it does from polished tiling. Sometimes it is waxed, so that it can shed the rain drops, and often it contains a substance called " cutin," which makes it waterproof. On many trees, rain drips from leaf-point to leaf-point, and is. Fig. SI. Part of the upper surface of a leaf, showing one of the stomata with its lips closed (very much magnified). shed as it would be from the shin- gles of a roof. On many low- growing plants it runs down the leaves, toward the main stem, and so reaches the roots. All through a bright summer day leaves and green twigs are breathing out vapor into the air. The rate of this slow steaming of the forest depends upon many things — the season, the weather, the temperature, and the nature of the trees. It is easy to test in a simple way this evapora- tion of summer boughs. Cut a growing, leaf-covered twig from some broad-leafed tree — such as a maple or cotton- wood. " Put the cut end of the twig through a. 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 Going, Maud, 1859-1925. Chicago, A. C. McClurg & Co.
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Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttrees, bookyear1916
