J46 



HlNtftALOGY Of AttRAti. 



Different $e- 

 eies of por- 

 phyry in one 

 mass. 



Code, a huge 

 mass of sand- 

 stone. 



Bed sandstone 

 intersected by 

 kisaltes. 



Red indurated 

 eftiy, capable 

 of a fine polish, 

 and being 

 ■wrought into 

 ornamental 

 vessels. 



blue basalt, with some streaks and spots of red intervening. 

 This vein seems to rise to the top of the mountain ; and it 

 exhibits a curious specimen of different species of porphyry 

 combined in the same mass. I do not see how the igneous 

 theory can account for it ; because, had it been raised from 

 the bowels of the earth in fusion, it ought to have been 

 homogeneous in its structure. The variety and separation 

 of materials show they had been conveyed into a chasm 

 in the strata, at different times, and from different soujyes ; 

 where they • consolidated, by the attraction of cohesion, 

 which operates upon bodies whose particles are brought 

 into close union, by extreme pulverization. The earths, 

 too, when minutely pulverized, combine with water, and 

 pass from it, either in the form of cement to unite the 

 grosser particles, or in the form of crystals. One point is 

 clear, that the feldtspars in this porphyry had not, like 

 those we have so often described, been conveyed to their 

 present situation in a solid state, because their angles are 

 not blunted, or worn. They must therefore have consoli- 

 dated where they are now found. 



The Cock is not a solid rock, .as I expected, but a huge 

 mass of sandstone that has fallen from the--rocks, and stands 

 on a narrow base upon the beach. It has acquired this 

 name from mariners, to whom it serves as a land-mark, and 

 to rwhom it presents a very lively representation of a cock 

 crowing, and clapping his wings. 



Contiguous to the Cock are irregular veins of basalt 

 intersecting red sandstone, of a dark blue colour internally ; 

 but the sides next the sandstone are of a deep red colour, 

 smooth and glossy like Roman bricks. The breadth of 

 these veins varies from about one to three or four inches. 

 Further on, the same sort of veins occur in red indurated 

 clay shiver. 



Several massy strata of indurated clay occur, of a florid 

 red colour, to which the sea has conveyed a fine polish. 

 From these, I am confident, vases, urns, jars, and all the 

 more durable species of earthen ware, might be fabricated, 

 susceptible of a jaspidean polish ; and, being variegated 

 with spots of different colours, might emulate the most 

 elegant porphyry. 



Within 



