Abstract

IN the account which Prof. Ledge gives of his very interesting experiments (NATURE, March 25, p. 484) he describes an observation which at first sight seemed to show the existence of residual diamagnetic polarity in a diamagnetic substance after exposure to a strong field, and remarks that this seemed an incomprehensible result. It appears to me that this result, should it be confirmed, is not incomprehensible on Weber's theory of diamagnetism, if we supplement that by a modification of the Ampere-Weber theory of ordinary magnetisation.

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