. Elementary plant physiology. Plant physiology. Growth. 31 twenty-four hours more, then measure again. Note the final amount of difference of elongation. 24. Relation of oxygen to growth.—Soak a number of seeds of wheat in water for a few hours, and then place a dozen in each of the bulbs of two respiration tubes or two small retorts (Figs. 15, 16). If respiration tubes are used, in- vert and fill with water, then invert in a dish of mercury, taking care to exclude all air. If a retort is used—and this apparatus will be found most suitable for this work—sup- port with the end of the out- let
. Elementary plant physiology. Plant physiology. Growth. 31 twenty-four hours more, then measure again. Note the final amount of difference of elongation. 24. Relation of oxygen to growth.—Soak a number of seeds of wheat in water for a few hours, and then place a dozen in each of the bulbs of two respiration tubes or two small retorts (Figs. 15, 16). If respiration tubes are used, in- vert and fill with water, then invert in a dish of mercury, taking care to exclude all air. If a retort is used—and this apparatus will be found most suitable for this work—sup- port with the end of the out- let resting in a dish of mercury. Fill with water, and seal the stopper in place with vaseline or wax. Raise the end of one respiration tube or one retort, and allow the air to enter as the water runs out, then replace in its original position. The water in the remaining tube or re- tort is to be replaced with carbon dioxide or hydrogen. To prepare hydrogen, put a handful of granulated zinc in a wide-mouthed bottle for which a tightly fitting stopper with two openings for tubing should be provided (Fig. 17). Insert a thistle tube or funnel in one opening, with its tube extending to the bottom of the flask. Insert a bent glass tube in the second opening, and connect it with a section of tubing bent at right angles, which extends through the stopper of a. Fiff. 16.—Small retort used for testing germination of seeds in an atmosphere lacking 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, London [etc. ] Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantph, bookyear1902
