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- 2 - b Since the calibration constant of the Lind electroscope used in these experiments had a value 7 x 10-9, which value we have shown in our statistical analysis to represent the transformation per second of 250 atoms or radon (plus its shortOlived active de- posit) it follows that the transformation of 90 atoms of thoron (plus Th A) should produce an initial drift of the leaf of nearly 0.25 divisions per second. Since the observed drift over the initial period of 54.5 seconds in testing Subject 0 was nearly 0.4 division per second, we see that the observed and expected values have the same order of magnitude. We recognize of course that several other factors enter into the problem, but a more precise analysis will not materially affect the conclusions here presented.

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