Abstract
July 21, 1685. Mr. President being in the Chair acquainted the Society that in Northamptonshire about two or three miles from Astrop, there is dug a heavy black earth, which being calcined comes to a black sand, some of which he was pleased to shew us, almost as heavy as ye earth: A Magnet being applied to this sand, was seen to attract it.
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Early Science at Oxford. Nature 116, 117 (1925). https://doi.org/10.1038/116117a0
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DOI: https://doi.org/10.1038/116117a0