Abstract
March 7, 1683/4.-After ye reading of ye Minutes, Dr. Plot was pleasd to acquaint ye Society that he had lately calcined clay-ochre, and stone-ochre (both which were yellow, from Shotover) about thirty-six hours, but neither of them applyed to ye Magnet; which gave ye Doctor grounds to question, whether yellow ochres will be affected by ye Magnet after any calcination, how long soever. Tobacco-pipe clay, Marl, Bole armeniac and Terra Lemnia were calcined ye same space of time, but none of them applyed to ye Magnet.
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Early Science at Oxford. Nature 115, 356 (1925). https://doi.org/10.1038/115356a0
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DOI: https://doi.org/10.1038/115356a0