. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 58 Principles of Plant Culture. dermis and cuticle (65), the nnmbev of stomata (66) etc. .SDiue plants, as purslane, the sedums, cacti etc., have special water-storing tissue, from which transpiration is extremelj' slow. Experiments indicate that the transpiration from most leaves is between one-third and one-sixth as much as the evaporation from an equal area of water. When we take into account the immense leaf surface of a large tree, it is e\ideu
. Principles of plant culture; an elementary treatise designed as a text-book for beginners in agriculture and horticulture. Horticulture; Botany. 58 Principles of Plant Culture. dermis and cuticle (65), the nnmbev of stomata (66) etc. .SDiue plants, as purslane, the sedums, cacti etc., have special water-storing tissue, from which transpiration is extremelj' slow. Experiments indicate that the transpiration from most leaves is between one-third and one-sixth as much as the evaporation from an equal area of water. When we take into account the immense leaf surface of a large tree, it is e\ideut that the aggregate transpiration must be very great, as is often illustrated by the dwarfing in- fluence of trees upon adjacent crops in dry Aveather (Fig. 26). Transpiration is much more rapid during dry. FtG. 28. Showing how a spruce hedge dwarfs an adjacent corn crop in dry weather. than during wet weather, and in the rare atmosphere of high altitudes than in the denser atmosphere of low lands. Excessive transpiration, as occurs in very dry weather, is detrimental to plants, since it reduces the water pres- sure within the cells below the point where healthful growth can take place (63); but normal transpiration, 1. e., not sufficient in amount to interfere with healthful growth, is doubtless beneficial, since it aids in carrying. 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 Goff, E. S. (Emmett Stull), 1852-1902. Madison, Wis. , The Author
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