This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...rate became lowered, though not to the original degree (fig. 159). It must be remembered, with regard to this, that the movement of sap depends on the cellactivity of the entire plant, and that the tissue has by this time absorbed some quantity of hot water, which cannot immediately be displaced by the water of ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...rate became lowered, though not to the original degree (fig. 159). It must be remembered, with regard to this, that the movement of sap depends on the cellactivity of the entire plant, and that the tissue has by this time absorbed some quantity of hot water, which cannot immediately be displaced by the water of ordinary temperature which is applied at the roots. The rate of suction, therefore, could not at once revert to the normal, but must be expected for some short period to show a slight enhancement. The curve shows that on the return to 23 C. the rate fell from fifty-eight to fourteen instead of to the original eight cubic mm. per minute. (2) Method of Hydrostatic Balance: (-) Action of cold.--For this experiment I took a Croton stem cut at both ends, the lower end being placed in the plant-vessel of the apparatus. There was now found to be a considerable movement of water upwards. This movement was arrested by suitable hydrostatic pressure, the upper end of the stem being connected with an india-rubber tubing filled with water and ending in a funnel (fig. 160). To prevent evaporation, the surface of the water in the funnel was covered with a thin film of oil. Rather a high hydrostatic pressure was required to produce a balance. When the pressure of a column of 75 cm. was applied, there was still a movement of water upwards in the tissue, at so great a rate as ten cubic mm. per minute. In this experiment, then, the root having been cut off, there is still a considerable propulsion of water upwards through the stem. It is thus clear that root-pressure is not the essential factor in the ascent of sap. As the leaves had also been cut off, and the cut end of the stem covered by water sealed with a film of oil, evaporation from the leaves, and the osmo...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.