CHANGES OF OUR GLOBE 



Some parts of this fiione being ckcayed by leEgtli of time, 



I 



form, together with a little mould, the farface, which is covered 



r 



e nature of this hill is, in 



with purflane, and fome graifes. 

 every refped, different from the reft of the ille, ^fpecially about 

 Crofs-Bay. For, as foon as v/e had reached the elevated plain, fi- 

 tuated between the bay and the hill, which is a-breail q£ the bay, 

 v/e found it about two miles in diameter, covered with black, gritty 

 llag-afhes, and in fome places with a dufky yellow ochre. At fixty 



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or eighty yards diftance, the plain is all over incum.bered with little 



r 



hummocks, about ten or twenty feet high, formed of very rugged 

 ilags and porous cinders j in fhort, of lava. All this plain is in- 

 clofed by feveral hills, of a conic form, and of a reddifh-brown or 

 rufty-coloured caft, conlifling entirely of fmall aflies, and gritty 



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diiTolved fla^s ; fome of which are black, and others of an ochreous 



^ V 



nature, and of a yellow or red colour. On one fide of the plain is 



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• an elevated ridge of rocks of the m.oft craggy appearance, lying in 

 ■ very irregular maffes, and terminating in the moft curious manner, 

 in points and fharp prominencies. Part of this ridge we could 



trace towards ths fea, v/here the 



flags. 



if poiTible, aiiumed flill 



more horrid jfhapes, interfered by deep gullies, forming a tremen- 



dous, inacceffible fhore. The flags or lava ring like .bells ; and, if 



a piece of it be broken and throv/n down the fides of thefe fceep 



■craggy maffes, it produces a fharp clanging found. At the very 



^53 



fliore : it confiflis of a gritty lime-tophus, mixed with marie and forma 



TION OF 



ISLES, 



X 



flril 



