20 



REMARKS 



N 



THE 



STRATA, gigantic ilatues of Eafler Illand are formed, and therefore they cannot 



\ 



1 



be of very remote antiquity, as the flone is of an extremely perifhable 

 nature. On the South fide of the iile, the whole cliff towards the 

 fea for more than a quarter of a mile confifts of folid ponderous rock. 



r 



\ 



of a honeycombed flag or lava, which may be expeded to yield fome 

 portions of iron. Beiides thefe, we faw feveral black glaffy ftones, 

 which to mineralogifls are known by th& name of black agate ("pt^- 

 mex vitreus Linn.) found in Iceland, J near the Vefuvio in Italy, 

 § the Mongibello in Sicily, and on the ille of Afcenfion ; \ in fhort 

 in all the neighbourhoods of volcanos. We obferved likewife a 

 flony, light, fpungy kind of lava, of a whitifh grey colour. 



The Marquesas have, a rocky fhore,. confifling of indurated 



clay; a ponderous, folid Hate, of a bluei": srre 



h 



fome iron particles; and laflly a f^ony kvn. which- is ei:her grey. 



«' 



colour, containing 



-■» 



ungy with lamellated, vitreous, pent:,^o:i.u cr i\ 



•^ *" 



_V 



o 



* iher!, of 



a browniihand in fome of a greenllh, or of a blackii!: colour, with 

 brownifh and fometimes white ilarlike or radiated flierl. The fur- 



face of the foil is a clay mixed 



h mould, which the 



nure with fliells. Under this mould is an earthy argillaceous fub- 



fiance, mixed with tarras and puzzolana. 



As we flaid but a few 



days here, we had 



r 



the ille. 



much time to examine the higher parts of 



O'Taheitee 



X Ferher's travels, p. 158. Mr. Rafpe's note. § Ferhr's travehy p. 157 



11 Cronfted's mineralogy, fed-. 295. p. 269. 



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