. Practical text-book of plant physiology. Plant physiology. INFLUENCE OF TEMPERATURE ' 93 late the data thus obtained and plot results of observations on the following points : 1. Percentage of germinations of the con- tinuously heated seeds at the different temperatures. 2. Per- centage of germinations of freshly treated seeds. 3. Comparison with first control lot. 4. Fatal temperature of the untreated seeds. 5. Fatal temperature of the acclimatized seeds. 144. Relation of Water Content to Endurance of High Tempera- ture. Select 100 plump seeds of corn or wheat. Plant ten in a germinator and
. Practical text-book of plant physiology. Plant physiology. INFLUENCE OF TEMPERATURE ' 93 late the data thus obtained and plot results of observations on the following points : 1. Percentage of germinations of the con- tinuously heated seeds at the different temperatures. 2. Per- centage of germinations of freshly treated seeds. 3. Comparison with first control lot. 4. Fatal temperature of the untreated seeds. 5. Fatal temperature of the acclimatized seeds. 144. Relation of Water Content to Endurance of High Tempera- ture. Select 100 plump seeds of corn or wheat. Plant ten in a germinator and grow. Place 50 in a small dish of water and after 12 hours set in incubator at 300 C. for 12 hours. Place 12 in germinator. Raise temperature to 400 C. for 12 hours and put in ten untreated seeds. Take out fresh lot and ten old seeds and germinate. Repeat at 450 C. and 50° C. Tabulate results as in. Fig. 41. Stage for exposure of mounted objects to different temperatures. A, A', screws for clamping to stage of microscope. B, outlet tube. B', inlet connecting with vessel containing water heated by a flame. C, condenser to illuminate object. A thermometer is set horizontally in the stage near the outer edge. the previous experiment, and determine same points, noting also in addition the lessened resistance of saturated seeds. Compare the acclimatization 145. Influence of Temperature upon Movement of Protoplasm. Mount a hair of Tradescantia or some convenient cell on a glass slip and place on a Reichert warm stage, or some other conve- nient form of apparatus on the stage of a microscope, and measure rate of movement of granules in a strand of cytoplasm by means 1 Just, Ueber die Einwirkung hoheren Temperaturen auf die Erhaltung der Keimfahigkeit der Samen. Cohn's Beit. z. Biol. d. Pflanzen. 2: 311. 1877. See also, Kindsel, W., in Landw. Versuchssta., 54 : 134. Please note that these images are extracted from scanned page images that may have been digitally
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