A study of the radio-activity of certain minerals and mineral waters.

Abstract
A considerable number of minerals are known in varying degrees to be radio-active. Lists have been given by M. and Madame Curie and by Sir W. Crookes, Except in the case of pitchblende, little has been done to determine the nature of the radio-active constituents; or to decide whether any hitherto unknown radio-active body is present.

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