. Experiments with plants. Botany. An arrangement for weighting an upward-growing stem. tionary engines does not usually exceed eighty pounds per square inch. If a spring is not at hand we may use in place of it a bottle filled with shot, as shown in Fig. 60. A simple method of test- ing the force of the upward growth of the stem is by pre- paring a strainer, as shown in Fig. 61, by thrusting the finger upward thi'ough the bottom. The plant is allowed to grow up into the cone thus formed and receives both air and light; shot may be poured into the strainer until the plant can no longer lift th
. Experiments with plants. Botany. An arrangement for weighting an upward-growing stem. tionary engines does not usually exceed eighty pounds per square inch. If a spring is not at hand we may use in place of it a bottle filled with shot, as shown in Fig. 60. A simple method of test- ing the force of the upward growth of the stem is by pre- paring a strainer, as shown in Fig. 61, by thrusting the finger upward thi'ough the bottom. The plant is allowed to grow up into the cone thus formed and receives both air and light; shot may be poured into the strainer until the plant can no longer lift the weight. As it is some- what difficult to bal- ance the load, we may use for this pur- pose the apparatus shown in Fig. 62. Three stout wire nails, about five inches long, are driven through holes previously bored in a board so as to be as nearly vertical as .i 1 rni 62. Modification of the arrangement shown possible. They are 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 Osterhout, Winthrop John Van Leuven, 1871-. New York, The Macmillan company; London, Macmillan & co. , ltd.
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