of loose rotten coal, as a firm roof is on the contrary of a good one. All feams of coal have their proper or peculiar claffes or covers belonging to them, which, without those marks, it would be in vain to make fearch for them; although iron ore is oftenfound near coal, yet on the contrary, lead is feldom found contiguous to it. A grey free-ftone commonly lies next to the coal, which is fpangled with fulphur, and which changing into a bituminous plate, is the roof and fupport of moft collieries. Seams of coal lie commonly on the fea-fide of mountains. In fome parts of England the feveral ftrata are, a white foapy earth, which the miners call coal metal, and is a good fign; under this comes a bed of freeftone of a grey colour, which changing into a black bituminous flate, is the cover of the coal, and these are the coal covers of Cumberland.

The principal and crofs roads of Ireland, as they lead from Dublin to the several towns. Corrected from an authentic furvey in 1780. The ftone or measured miles are marked f. farther fide from Dublin f. f. neareft fide to Dublinn n. f. The cross roads*. A poft town. To avoid repetitions, there are eafy references to the letters A. B. C. &c. Read thus, from Dublin to Swords 6, Swords to Balrothery 8, and to Drogheda 9, making together 23.

From