The Teaching Botanist a Manual of Information Upon Botanical Instruction Toget
The Teaching Botanist a Manual of Information Upon Botanical Instruction Toget
William Francis Ganong
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Study in the same manner the germinating Horse Bean. 12. Study in the same manner the germinating Morn- ing-glory. 13. Study in the same manner the germinating Corn. 14. Select any one of the above kinds of seeds, and make a series of outline drawings to illustrate Exercise 10 (7). 15. Your studies (Exercises 10 (7) and 14) have shown you that the positions taken by hypocotyl and plumule in growth are entirely independent of the position of the seed from which they came. Their up-and-down posit...ion suggests that gravi- tation may have something to do with it. To test this, the logical plan is to place two sets of seeds under conditions precisely alike, except that gravitation is allowed to act upon one set and not upon the other. Since, however, nothing upon the earth can be removed from the influ- ence of gravitation, it is necessary so to arrange 78 THE TEACHING BOTANIST one set that gravitation may be made to neu- tralize its own effects. This has been done in Experiment i, in which the two sets of seeds are under the same conditions of temperature, light, moisture, food supply, and differ only in their relation to gravitation.
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