. Effects of the rays of radium on plants. Plants. 86 EFFECTS OF EXPOSING SEEDS in the propagating-house. Control culture same as in Experiment i. February 9, 9 A. M. The cotyledons of all four seeds are emerging, but they are not yet raised above the surface of the soil. February 11, 3 : 30 P. M. The cotyledons are all clear of the ground, all spreading and showing the plumule. In height the plants are intermediate between the radiated and the control in Experiment i. Length of hypo- cotyls above the surface of the soil as follows : Radium mm. mm. Total. mm.
. Effects of the rays of radium on plants. Plants. 86 EFFECTS OF EXPOSING SEEDS in the propagating-house. Control culture same as in Experiment i. February 9, 9 A. M. The cotyledons of all four seeds are emerging, but they are not yet raised above the surface of the soil. February 11, 3 : 30 P. M. The cotyledons are all clear of the ground, all spreading and showing the plumule. In height the plants are intermediate between the radiated and the control in Experiment i. Length of hypo- cotyls above the surface of the soil as follows : Radium mm. mm. Total. mm. Total. Average height, mm. Average height, -|- mm. February 16, 12 M. Length of Hypocotyls Above the Surface of the Soil. Radium Control mm. mm 23-50 23-50 mm. Total. mm Average length, 20, ,25 mm 1. Average length, Experiment 3 Total. April 15, 6: 20 P. M. Twenty seeds of " Lincoln" oats, with the glumes removed, were placed in two parallel rows with the radicle ends touching and the embryo side upermost. Over them was laid the tube of RaBrg (1,500,000 X), resting on the radicle ends of the seeds. Control with empty tube, and both sets placed in the dark room. April 22, II : 30 A. M. After an exposure of 6 days and 15 hours, both sets of seeds. 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 Gager, C. Stuart (Charles Stuart), 1872-1943. New York
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectplants
