. Effects of the rays of radium on plants. Plants. EFFECTS OF EXPOSING SEEDS III greatly retarded (figure 9), and roots were fewer in number, shorter, thick, and club-shaped, with the slightly more numerous root-hairs nearly twice the normal length. The root-tips of the exposed plant- lets were of a decidedly darker color than those of the control. 4. Effect of Duration of Exposure and Degree of Activity In the preceding experiments it has become more and more clearly evident that the effect of exposure to radium rays varies, as Koernicke also found, with the duration of the exposure and the d
. Effects of the rays of radium on plants. Plants. EFFECTS OF EXPOSING SEEDS III greatly retarded (figure 9), and roots were fewer in number, shorter, thick, and club-shaped, with the slightly more numerous root-hairs nearly twice the normal length. The root-tips of the exposed plant- lets were of a decidedly darker color than those of the control. 4. Effect of Duration of Exposure and Degree of Activity In the preceding experiments it has become more and more clearly evident that the effect of exposure to radium rays varies, as Koernicke also found, with the duration of the exposure and the degree of activity of the radium. The purpose of the following six experiments was to confirm this fact, and get more accurate data on the relation between the duration, the degree of activity, and the effect produced. Experiment 26 The object of the following experiment is to ascertain the effect on the germination and growth of corn {Zea Mays) of exposure for 120. 10 11 12 13 Day of month 15 Fig. II. Effect on the Growth of Zea Mays of Exposing the Grains, before Plant- ing, iomU Hours, to Rays from Radium of Different Degrees of 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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