. Practical text-book of plant physiology. Plant physiology. 176 EXCHANGES AND MOVEMENTS OF FLUIDS 4> /^\ w. Fig. 84. 245. Increase in Walls by Imbibition. Cut longitudinal and transverse sections from stalks of Laminaria which have been pre- served dry, or in alcohol, and mount in al- cohol. Measure the thickness of the walls by means of a micrometer eyepiece. Meas- ure changes in length of a strip 2 cm. long. Now put a strip of blotting paper in contact with the edge of the cover-glass on one side and run a large drop of water in at the other as the alcohol is withdrawn. Compare the incre
. Practical text-book of plant physiology. Plant physiology. 176 EXCHANGES AND MOVEMENTS OF FLUIDS 4> /^\ w. Fig. 84. 245. Increase in Walls by Imbibition. Cut longitudinal and transverse sections from stalks of Laminaria which have been pre- served dry, or in alcohol, and mount in al- cohol. Measure the thickness of the walls by means of a micrometer eyepiece. Meas- ure changes in length of a strip 2 cm. long. Now put a strip of blotting paper in contact with the edge of the cover-glass on one side and run a large drop of water in at the other as the alcohol is withdrawn. Compare the increase in the thicknesses of the wall in the three axes of the stalk. 246. Energy of Imbibition. Secure a screw- topped jar, at least 6 cm. in diameter and 10 cm. in width, or use a Mason fruit jar. Make a manometer by sealing one end of a glass tube with an internal diameter of 2 mm., and then bending it twice at right angles to form a U the arms of which are at least 15 cm. long, with the free open arm twice this length. Thrust the free arm through a hole of sufficient size cut through the metal cover of the jar. Run in enough mercury so that it will stand at about 8 cm. in both arms at normal pressure and run water into the free arm by means of a minute glass or metal tube until it is full. Care must be taken to have it rising to the same height in, the arms. Now fill a rubber bulb of a capac- ity of about 100 cc. with water and fasten to the open end of the manometer, and after it is in place run a wire along the tube into the bulb to relieve any compression set up. Withdraw the wire and use it to bind the mouth of the bulb tightly to the manometer arm. The wire. 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 MacDougal, Daniel Trembly, 1865-1958. New York [etc. ] Longmans, Green, and Co.
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