Abstract

THE following quotations from a book printed nearly one hundred years ago (Murray's “Elements of Chemistry.” Sixth edition, Edinburgh, 1828) bear on the observations of an anomaly in frictional electricity referred to recently in NATURE (June 21, p. 914). “A white silk ribbon rubbed against a black one becomes positively electrified; but if the black ribbon be worn so that the colour is faded, and if the white ribbon be heated, the latter will be found to be negative, and the black positive”.

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