Abstract
THE author supplies in this book further ingenious experimental devices in which use is made of automatic recording methods and of various methods of magnifying small movements. The rate of ascent of sap is measured by a mechanical method recording the re-erection of a drooping tissue as sap enters it, and by an electrical method in which a quadrant electrometer is used to determine change of electromotive force between two points, one of which changes in turgor. By placing one electrode, carefully insulated save at the point, upon a graduated micrometer screw movement, the instrument becomes an electric probe by which the most vigorous changes in turgor are traced in the Dicotyledon stem to the living tissues in the region between inner cortex and vascular tissue.
The Physiology of the Ascent of Sap.
By Sir Jagadis Chunder Bose. (Cossimbazar Endowment Publication.) Pp. xv + 277. (London: Longmans, Green and Co., 1923.) 16s. net.
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The Physiology of the Ascent of Sap. Nature 112, 234 (1923). https://doi.org/10.1038/112234a0
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DOI: https://doi.org/10.1038/112234a0