. Effects of the rays of radium on plants. Plants. EXPOSED WATER AND FRESHLY FALLEN RAIN 173 2. The Radioactive Influence of Freshly Fallen Rain-Water The fact that freshly fallen rain-water is radioactive suggested the following experiments to ascertain its effect on growth. Experiment 52 May 28, 6 P. M. In a glass beaker, washed chemically clean, was caught rain- water. The beaker was set in an open place to avoid drippings from buildings and trees. It had been raining almost constantly dur- ing the preceding day ( in. precipitation), and slightly all the morning of the twenty-eighth. Th
. Effects of the rays of radium on plants. Plants. EXPOSED WATER AND FRESHLY FALLEN RAIN 173 2. The Radioactive Influence of Freshly Fallen Rain-Water The fact that freshly fallen rain-water is radioactive suggested the following experiments to ascertain its effect on growth. Experiment 52 May 28, 6 P. M. In a glass beaker, washed chemically clean, was caught rain- water. The beaker was set in an open place to avoid drippings from buildings and trees. It had been raining almost constantly dur- ing the preceding day ( in. precipitation), and slightly all the morning of the twenty-eighth. Thus the atmosphere was thoroughly washed, and the probability of traces of ammonia and COg and any atmospheric dust in the rain-water was slight. No electrical disturb- ance had accompanied the 20 Day of month Fig. 41. Effect on Growth of placing a sealed glass Tube of Radium of 10,000 activity into Water in which Roots of Luptnus albus are growing. Into the water thus collected were immersed, to a measured length of 15 mm., the tap roots of four germinated seeds of Lufiniis albus. Since rain-water is practically distilled, a control was similarly ar- ranged with distilled water, also in a chemically clean beaker. The following observations were recorded of the amount of elongation of the roots :. 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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