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Sir, The Honour you were pleased to do me some Months ago, in the favourable Reception of an impertinent Visit, emboldens me to apologize for Non-performance of my Promise, which you accepted of, for sending you some of our Coal-Marcasites, and subterraneal Sublimates, from the fired Coal-Mines near our Town; the Weather having been such, by Storms of Snow, violent Rains and Thaws, and keen Frosts, as it was not possible to gather the Evomitions of ourVulcano’s ; and theSpecimina of them which I had by me being too small to offer, for Satisfaction of so many Trials, as I know you would have been desirous to put them to; and the Marcasites, I feared, alone might have been an Oblation too trivial for your Acceptance.

philosophical transactions of the royal society of london

X. A letter from Mr. J. Durant to the Honourable Robert Boyle, Esq; F. R. S. concerning a coal-mine taking fire near Newcastle upon Tyne; of the blue well; and of a subterraneous cavern in Weredale; lately communicated by the same hand