. A laboratory course in plant physiology. Plant physiology; Plant ecology. w A B C D E F Fig. 38.—Various forms of adapted osmoscopes; X%. Double lines are glass, black lines are membranes, and dotted areas are stoppers. effected in the stoppered forms, but may be accomplished, though with some trouble, in the thistle-tube form by pouring the liquid cautiously down a wire. A somewhat well-known make-shift instrument, more troublesome, however, to prepare, as I should suppose, than some of the above, is that using the membrane of an egg, described by Bergen in his elementary text-books. An osm
. A laboratory course in plant physiology. Plant physiology; Plant ecology. w A B C D E F Fig. 38.—Various forms of adapted osmoscopes; X%. Double lines are glass, black lines are membranes, and dotted areas are stoppers. effected in the stoppered forms, but may be accomplished, though with some trouble, in the thistle-tube form by pouring the liquid cautiously down a wire. A somewhat well-known make-shift instrument, more troublesome, however, to prepare, as I should suppose, than some of the above, is that using the membrane of an egg, described by Bergen in his elementary text-books. An osmoscope of this kind may very readily be converted into an osmom- eter by using a graduated tube and a known quantity of solution. Further, it would be possible to make any of these forms autographic by use of a frictionless float and a recording wheel like those later described under Growth. Where an experiment is long continued, the molasses or other solution may be kept from fermentation by the addition of 2-3% of forma- lin, while evaporation may be checked by a covering of 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 Ganong, William Francis, 1864-1941. New York, H. Holt and Co.
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