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Rh about Harlech in Merionethshire, was annoyed about eight months by a fiery exhalation, that was seen only in the night, and consisted of a livid vapour, which rose from the sea, or seemed to come from Carnarvonshire, across a bay of the sea eight or nine miles broad on the west side. It spread from this bay over the land, and set fire to all the barns, stacks of hay and corn in its way. It also infected the air, and blasted the grass and herbage in such a manner that a great mortality of cattle, sheep, and horses ensued. It proceeded constantly to and from the same place, in stormy as well as in calm nights; but more frequently in the winter than in the following summer. It never fired any thing but in the night, and the flames, which were weak and of a blueish colour, did no injury to human creatures; for the inhabitants did frequently rush into the middle of them, unhurt, to save their hay and corn. This vapour was at length VOL. 1.