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The earliest mediaeval notice of mineral coal I have met with is in a passage cited by Ducange from a document of the year 1198, and it is an etymological observation of some interest, that carbones ferrei, as sea-coal is called in the document, are said by Ducange to have been known in France by the popular name of hulla, a word evidently identical with the modern French houille and the Cornish Huel, which in the form wheal is an element in the name of many mining localities.
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