This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ... of least resistance towards the mesophyll, and as long as the evaporation goes on more water flows into the cells, to replace that lost, from the vessels of the stem, when the watercolumns are supported and moved partly by capillarity and by the air bubbles in the cavities, and partly by a peculiar co ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ... of least resistance towards the mesophyll, and as long as the evaporation goes on more water flows into the cells, to replace that lost, from the vessels of the stem, when the watercolumns are supported and moved partly by capillarity and by the air bubbles in the cavities, and partly by a peculiar co-operation of the living cells of the medullary rays. The second point referred to above is that the evaporation from the mesophyll cells will be the more rapid in proportion as the air outside is drier and the stomata wide open; and the more energetic this evaporation is, the more salts the mesophyll cells will acquire in a given time, because, of course, the salts do not pass away in the evaporated water but are left in the cells. It has been calculated that an oak-tree may have 700,000 leaves, and that 111,225 kilogrammes of water may pass off from its surface in the five months from June to October, and that 226 times its own weight of water may pass through it in a year. Now comes the question--What are the salts needed for that so much mechanism should be expended on their accumulation? To answer this we must look at the mesophyll cells a little more closely. Each of these consists of a thin cellulose cell-wall, lined with colourless protoplasm, which encloses a large sap-cavity (vacuole) j in the protoplasm are embedded a number of bright green, rounded chlorophyll corpuscles, a relatively large nucleus, and a few less conspicuous granules, &c. The cell-sap contains various substances dissolved in water. Some of these substances are salts and other materials ready to be made use of; others are, so to speak, waste products or worked-up materials that are going to be got rid of, or sent to places where they will be made use of, ...
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Seller's Description:
This is an ex-library book and may have the usual library/used-book markings inside. This book has hardback covers. In good all round condition. No dust jacket. Cloth bound. Tightly bound. Clean inside. Deckled edges. Library sticker on front cover. Please note the Image in this listing is a stock photo and may not match the covers of the actual item, 400grams, ISBN: