. Effects of the rays of radium on plants. Plants. EFFECTS OF EXPOSING SEEDS 119 less not all of the four seeds of any given set were equally exposed, though great care was taken in this regard. The necessity of using such a small number of seeds was doubtless here (as in other experi- ments) a source of error, by emphasizing individual variations, but this could not well be eliminated on account of the scarcity of the radium, and the comparatively short period of time that any given preparation was at my .10 11 12 Dau of month 13 Fig. 16. Effect on the Growth of Zea Mays of Various
. Effects of the rays of radium on plants. Plants. EFFECTS OF EXPOSING SEEDS 119 less not all of the four seeds of any given set were equally exposed, though great care was taken in this regard. The necessity of using such a small number of seeds was doubtless here (as in other experi- ments) a source of error, by emphasizing individual variations, but this could not well be eliminated on account of the scarcity of the radium, and the comparatively short period of time that any given preparation was at my .10 11 12 Dau of month 13 Fig. 16. Effect on the Growth of Zea Mays of Various Durations of Exposure of the Grains, before Planting, to Radium Rays. Activity, 1,500,000. Interpretation of the results is greatly facilitated by inspection of the curves (figures 10-12). In figure 10 it is clearly shown that, for an exposure of 16 hrs., the effect of the rays from the preparations of 1,500,000 X and 1,800,000 X varied directly as the activity of the radium. The same fact is clearly indicated in figures ii and 12, where the exposures were respectively for 24 and 33 hours. The immediate effect of exposure for 16 hrs. to the radium of 10,000 X (figure 10) was a greater retardation of growth than that produced by the next more active preparation, but from the third day. 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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