90 Dr. KiDD 071 the Mhicralogy of St. Daviifs, 



appearance of the kind observed in the neighbourhood of St. 

 David's. 



The Internal texture of many of the rocks about Treginnys, and 

 in the road between that place and St. David's, resembles that of a 

 very compact mechanical aggregate, the particles of which are 

 however obscurely defined : the predominating colours are green, 

 greenish-white and pale purple : the character of the recent fracture 

 is like that of coarse steatite. A close inspection brings to view 

 numerous ciystalline surfaces of semltransparent laminated felspar, 

 and particles of glassy quartz ; and it is worth noticing that the 

 felspar and quartz now and then occur in the substance of the im- 

 bedded particles as well as in the cementing medium, shewing a 

 probably cotemporaneous formation of the whole mass. 



Some of the rocks of this neighbourhood approach to serpentine 

 in their general character, and contain veins of indurated steatite. 



Ramsey. 



This is by far the largest of a number of rocky islands lying off 

 the coast of St. David's, and is separated from the main land by a 

 channel of about two or three miles in breadth. The greatest ex- 

 tent of the island is from north to south, and at each extremity 

 in this direction is an elevated summit, or beacon, of considerable 

 height, the general character of each of which is similar to that of 

 the corresponding summits on the main land. The intervening 

 rocks are principally slaty. The western front of each of these two 

 summits projects into the sea far beyond the intermediate space of 

 land ; and it appears probable that the bay interposed between the 

 promontories has been cut out by the dashing of the waves against 



