. Bulletin. Forests and forestry -- United States. 16 A PRIMER OF Fig. 14.—By comparing tliis diagraiu with Pis. VII-IX and i\g. 16, the place of each cut in the tree will be raade clear. TRANSPIRATION. The leaves give out not only the oxygen derived from the decomposition of carbonic acid gas taken from the air and carbonic acid gas i)roduced inbreath- ing, but also great quan- tities of water vapor. The amount of water taken up by the roots is very much larger than is required to be com- bined with carbon and the earthy constituents in the leaves. In order that fresh supplies of e
. Bulletin. Forests and forestry -- United States. 16 A PRIMER OF Fig. 14.—By comparing tliis diagraiu with Pis. VII-IX and i\g. 16, the place of each cut in the tree will be raade clear. TRANSPIRATION. The leaves give out not only the oxygen derived from the decomposition of carbonic acid gas taken from the air and carbonic acid gas i)roduced inbreath- ing, but also great quan- tities of water vapor. The amount of water taken up by the roots is very much larger than is required to be com- bined with carbon and the earthy constituents in the leaves. In order that fresh supplies of eartliy constituents in solution may reach the leaves rapidly, the water already in them must be got out of the way. This is effected by transpiration, which is the evap- oration of water from all parts of the tree above ground, but princi- pally from the leaves. Even where the bark is very thick, as on the trunks of old Oaks and Chestnuts, transpiration goes on through the lenticels in the bot- toms of the deep cracks. It sometimes happens, especially in spring before the leaves come out, that transpiration can not get rid of the water from the roots as fast as it rises, and that it falls in droi)S from the buds, or later on even from the leaves 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 United States. Division of Forestry. Washington : G. P. O.
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