. Agriculture through the laboratory and school garden. Agriculture. SOIL MOISTURE AND PREPARATION OF SOIL. 61 osmosis. Thus the soil water not only dissolves the plant-food, but through capillary action and osmosis actually carries this food to the plant. Experiment 9.—{a) Take any single-stemmed grow- ing plant, place the roots in a wide-mouthed bottle half full of water. {b) Make the bottle air-tight (to avoid the evaporation of the water) by splitting a cork into halves, hollowing out the center, and fitting them about the stem of the plant; now fill any crevice about the stem, or in the t
. Agriculture through the laboratory and school garden. Agriculture. SOIL MOISTURE AND PREPARATION OF SOIL. 61 osmosis. Thus the soil water not only dissolves the plant-food, but through capillary action and osmosis actually carries this food to the plant. Experiment 9.—{a) Take any single-stemmed grow- ing plant, place the roots in a wide-mouthed bottle half full of water. {b) Make the bottle air-tight (to avoid the evaporation of the water) by splitting a cork into halves, hollowing out the center, and fitting them about the stem of the plant; now fill any crevice about the stem, or in the top of the cork, with melted paraffin.* Invert the bottle to see if any water escapes ; if so, the cork is not fitted air-tight, and melted paraffin must be applied where it leaks. (c) When the bottle is air- tight weigh it, and record date and weight. The follow- ing day place it where the plant will be exposed to direct sunlight, and weigh every day or two for two or three weeks. How much water has the plant used ? Of what use to the plant was the water? Hellriegel, through his experiments, found. FIG. 19. —APPARATUS FOR EXPERIMENT 9. * Paraffin melts at a low temperature, and will not injure the plant if carefully 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 Jackson, Caroline Ruth, 1871- [from old catalog]; Daugherty, Millie (Crum) "Mrs. L. S. Daugherty," 1859- joint author. [from old catalog]. New York, O. Judd company
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