2 3 g TRAVELS THROUGH 



7. with white loofe lava and its farinaceous merls, 

 affected or diffolved by fulphureous acids. 8. Near 

 Bolzena, clofe to die right hand of the road, a 

 remarkable bafalt-hill. Its ground or foot is a 

 ftratum of grey volcanic afhes, mixed with fmall 

 farinaceous white fherl points, one fathom thick, 

 nearly horizontal, and compofed of parallel fmaller 

 beds or {tripes, produced, as the beds in the vol- 

 canic tufo-hills, near Naples, by the equal falling 

 of the allies. Thefe grey afnes are entirely unaf- 

 fected by 'the acids, probably owing to their having 

 been ever dcftitute of calcareous particles, or having 

 been elixiviated by many years rain-waters. Now 

 and then appeared in it fome fmall grey pumice- 

 Hones. On this cinericious beddi'ng lieth, for a 

 long extent, ftrctching on both fides five or fix 

 fathoms, a {Iratum of regular bafalt-prifms. Their 

 fubftance hard compact lava, fprinkied with fmail, 

 white, vitreous garnet-like Iherls, or with fmall 

 black fherl- feathers ; fcarcely any interval between 

 them , each column or prifm five or fix palmi 

 long, one paln> diameter, on both ends flat; ge- 

 nerally of an hexagonal form, either with equal 

 fides or two oppofite greater ones ; feme of five, 

 four, and three fides j upon the whole, fo regular, 

 that their cryrhllization cannot be doubted, and 

 being con* poled of lava, its cryflallization, when 

 . in a Hats of fufion, cannot be controverted. They 

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