Abstract
IN a letter to NATURE of February 13, the question is raised by Mr. W. W. Strong whether the larger proportion of the penetrating radiation may not arise from active matter in the air rather than in the ground. Unless the earth's supply of active matter is augmented from without, or unless it arises in a manner at present unknown, the question may be negatived, and a numerical answer given with some approach to accuracy.
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EVE, A. The Penetrating Radiation . Nature 77, 486 (1908). https://doi.org/10.1038/077486b0
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DOI: https://doi.org/10.1038/077486b0
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