* This gentleman, in the year 1806, communicated to the Royal Society a most interesting map and account of the great coal-field in South Wales, lying there in a limestone basin, which are printed in the Philosophical Transactions of that year: from what I have since read of Coal-fields, in William's "Mineral Kingdom", Westgarth-Forster's "Treatise on a Section of Strata", Farey's "Derbyshire Report" vol i &c. I am inclined, however, to think, that some at least of the coal-fields in the middle and north-eastern parts of the island, do not agree with those on the western side of it, to which Mr. Martin here alludes, in basseting on all sides from out of a limestone basin - EDITOR.