File:Text-book of botany, morphological and physiological (1875) (14778147932).jpg

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Identifier: textbookofbotany00sach (find matches)
Title: Text-book of botany, morphological and physiological
Year: 1875 (1870s)
Authors: Sachs, Julius, 1832-1897 Bennett, Alfred W. (Alfred William), 1833-1902 Thiselton-Dyer, William T. (William Turner), 1843-1928
Subjects: Botany
Publisher: Oxford, Clarendon Press
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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he WUrzburglaboratory, in the summer of 1872, R r 6io MOLECULAR FORCES IN THE PLANT. pressure at the cut surface is at zero. A second root-stock from a plant of exactlythe same age and vigour and grown in a pot of the same size is provided with theapparatus figured in Fig. 440, where the tube / through which the outflow takesplace reaches the vessel h through the cork g. This vessel contains water above,mercury below. A tube k rises from the cork i to a certain height and is bent roundat the free end 0 where it dips into a graduated tube. If the apparatus is so contrivedthat, for example, the opening for the outflow o stands about 15 cm. above the level «,then the column of mercury o?i exercises a pressure of 15 cms. on the water h, andthrough it on the cut surface at b. When the water begins to flow out from the cutsurface at b, the quantity of water in h will be increased, and an equal volume of mer-cury will flow out at 0. The mercury collects in the burette, and its level enables
Text Appearing After Image:
Fig. 440.—Apparatus for measuring; the root-pressure when considerable and constant. The cork I has a lateral incisionin order to allow of the escape of the air when the mercury is dropped in. the quantity of water which has flowed from the cut surface to be read off from hourto hour, and to be compared in the other apparatus where there is no pressure. Aftera longer period of observation, the level n falls sensibly and the pressure on augments alittle. But it is easy to bring it again to the original amount if a fresh quantity of mercuryis poured in every twelve hours. I observed in this manner in the summer of 1870 for five days two equally strongroot-stocks of the sunflower^; and the result was that the difference of the outflow wasbut small, although the amount of pressure in one case was zero, in the other case17 cm. of mercury. In the first thirty-three hours the outflow where there was nopressure at the cut surface amounted to 26-45 cubic cm.; when the pressure was 17 cm. ^ I

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