. Experiments with plants. Botany. 72 EXPERIMENTS WITff PLANTS often lifting up a good-sized lump of earth on emerg- ing; the Castor-bean doubles and twists (Fig. 58), like an athlete straining every muscle; why does it have so much trouble? Does the growth of the seed-leaves while still underground account for it 1 Suppose we re- move all hindrances from the Castor-bean; will the stem still form the characteristic "loop"? Allow some to germinate on the surface of the soil, or, better, in a flower-saucer which has been boiled (since Castor-beans are very apt to mould). Cover this wit
. Experiments with plants. Botany. 72 EXPERIMENTS WITff PLANTS often lifting up a good-sized lump of earth on emerg- ing; the Castor-bean doubles and twists (Fig. 58), like an athlete straining every muscle; why does it have so much trouble? Does the growth of the seed-leaves while still underground account for it 1 Suppose we re- move all hindrances from the Castor-bean; will the stem still form the characteristic "loop"? Allow some to germinate on the surface of the soil, or, better, in a flower-saucer which has been boiled (since Castor-beans are very apt to mould). Cover this with a piece of glass which has been boiled in water or rinsed in two per cent forma- lin. Remove the coats from a part of the seeds, so that they may be freed from all hindrances which might cause the formation of the "; Place some with the caulicle downward, others with the caulicle upward. Try the same experiment with other seeds which form a "; What part of the plant forms the "loop" in the Onion ? What plants do not form a "loop" ? (Notice especially Corn and Grasses.) How much opposition can the stem overcome in forc- ing its way upward? We may test this by means of the apparatus shown in Fig. 59. Find two bottles. 58. Castor-bean twist- ing itself into a loop in its efforts to pull the seed-leaves oxit of the 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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