. A text-book of botany for secondary schools. Botany. LEAVES amount of water given off by a few leaves is noted, some vague idea may be formed as to the amount given off by a great mass of vegetation, such as a meadow or a forest. One observer has stated that a single stalk of corn during its life (173 days) transpired about four gallons of water; and that a single hemp plant (140 days) transpired nearly eight gallons. An- other observer esti- mated that a sun- flower, whose leaf surface was approxi- mately nine square yards, gave off near- ly one quart of wa- ter in a single day. 16. Growth.
. A text-book of botany for secondary schools. Botany. LEAVES amount of water given off by a few leaves is noted, some vague idea may be formed as to the amount given off by a great mass of vegetation, such as a meadow or a forest. One observer has stated that a single stalk of corn during its life (173 days) transpired about four gallons of water; and that a single hemp plant (140 days) transpired nearly eight gallons. An- other observer esti- mated that a sun- flower, whose leaf surface was approxi- mately nine square yards, gave off near- ly one quart of wa- ter in a single day. 16. Growth.—In very young leaves growth takes place at the apex, but this may cease early. The subsequent growth often occurs at the base of the blade, in a special growing region, as may be seen in long and narrow leaves such as those of grasses. To discover these special regions of growth in leaves, some rapidly growing plants (such as the gourds) should be cultivated in pots. When the young leaves first appear, a scale should be marked off in India ink with a pointed camel's hair brush on the petiole (if there be one) and the midrib. The scale should be made 3. Fig. 17.—Transpiration experiment : a potted gera- nium sealed with a rubber cloth and covered with a bell jar; the mist and droplets of water on the glass more or less obscure the 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
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
