128 TRAVELS THROUGH 



try covered by them as with fnow (bowers. Thefe 

 afhes have been in different, yea, in the very fame 

 eruptions, of different colour; hence it comes, 

 that either they appear in one hill brown, in ano- 

 ther black, in a third yellow, and in a fourth grey 

 or white ; or, that all thefe different colours offer 

 in different thin ftrata of one and the fame hill ; 

 which, by that circumftance, gets a ftriped varie- 

 gated appearance. Even thofe of the fame co- 

 lour fhew different beds, and thefe feem at firfl 

 fight to have been produced by water; which is 

 an illufion, fince thefe beds are owing to the dif- 

 ference of the afhes, which have been fucceffively 

 coarfe or fine, pure or mixed, and more or lefs 

 mixed with pumice-ftones, of a brown, red, black, 

 or grey colour. Thefe beds appear often in an 

 oblique dipping fituation, which is to be afcribed 

 cither to the falling of the afhes on dipping flats, 

 or the difordering of the hills by earthquakes. 

 Time, prefllire, rain, froft, and heat, have ferru- 

 minated and coagulated the afhes to a tufo-ftone, 

 which is commonly yellowifh, brown, or grey 

 coloured. The " ferruminating quality of thefe 

 afhes has co-operated in that petrifaction. Pau- 

 filippo, and a great many other hills, as far as 

 Cape Mifenoy are cornpofed of fuch tufo; and all 

 the antiquities of this country, are either buried 

 or built with that cinericious {tone. Pompeja and 



Hcrcula- 



