378 



MINERALOGICAL OBSERVATIONS 



sident, a great deal of the country has been ex- 

 plored. We are already approaching a compe- 

 tent knowledge of the structure of the British 

 Isles. 



The purpose of this paper, is to attempt^ in as 

 far as my slender ability and information will per- 

 mit, to promote the further progress of this very 

 desirable object. I some time ago, and before ha- 

 ving had the honour to be a member of this So- 

 ciety, was flattered, by the approbation it was 

 pleased to give, of a short paper of mine, rea4 

 before it by the President, oii the Extent, Na- 

 ture, Position and Connection, of one of the Gra- 

 nite Districts of Galloway. At present, it is my 

 intention to detail a few observations, which I 

 have since made on another of these districts. It 

 is known that there are three of them, and that in 

 all, the granite is at no great distance from the 

 transition-rocks. It would, however, in the pre- 

 sent state of our knowledge, be unwarrantable to 

 say, that it is transition-granite. For though, at 

 no great distance from the transition- rocks, yet, 

 in only one place, viz. on the Burn of Palnure, as 

 mentioned in my paper formerly alluded to, did I 

 perceive the grey-wacke in actual contact with 

 the granite. In all the other places, in so far as 

 I have seen or heard of, there intervenes another 

 rock betwixt them, totally different from either. 

 3ut though the grey-wacke seemed to me to be ia 



