. Notes on the life history of British flowering plants. Botany; Plant ecology. INTRODUCTION 21 between the outside air and the intercellular spaces in the leaf-tissue, which are specially developed on the lower face of the leaf (see Fig. 11 below). Through the stomata also escapes the surplus water in which the nitrogenous and other mineral food has been carried up from the roots to the leaves. Some of the water is required for nutrition and as cell-sap to maintain the turgescence of the tissues, but a large proportion serves only as a carrier, and is ultimately given off, or trans- pired, th
. Notes on the life history of British flowering plants. Botany; Plant ecology. INTRODUCTION 21 between the outside air and the intercellular spaces in the leaf-tissue, which are specially developed on the lower face of the leaf (see Fig. 11 below). Through the stomata also escapes the surplus water in which the nitrogenous and other mineral food has been carried up from the roots to the leaves. Some of the water is required for nutrition and as cell-sap to maintain the turgescence of the tissues, but a large proportion serves only as a carrier, and is ultimately given off, or trans- pired, through the stomata. They are very Fig. 6.—Loiigitadiual section through the growing point of a winter bud of Abies peotinata. x aliout 200. .s; apex of growing point ; b, b, youngest leaves ; r, cortex ; m, pith. It is estimated, for instance, that on such a leaf as that of the Oak there are not less than 2,000,000. The carbon is assimilated and the oxygen released, at least in part. It is remarkable that plants do not take up carbonic acid from the soil. It might have been expected that the roots, ramifying as they do in earth more or less saturated with water containing carbonic acid in solution, would absorb what is so important an element in their food. This function is, however, mainly performed by the leaves, and especially under the influence of daylight. It is carried on by protoplasm containing " chlorophyll ; These are roundish green corpuscles, which give their peculiar. 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 Lubbock, John, Sir, 1834-1913. London, New York, Macmillan and Co. , Ltd.
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