8o OBSERVATIONS 



which I had drawn from the Angular fpecimen of the Portfoy 

 granite *. 



It was in the year 1785, that we were thus gratified by a fight 

 of the junction of the granite with the Alpine fchifte, or primary 

 ftrata, as they may be called, of the north country. We now 

 were eager to fee the junction of the granite country, which I 

 knew to be at the head of Loch Dune, with the fchiftus ftrata 

 of the fouth of Scotland. In the year 1786, therefore, Mr 

 Clerk and 1 fet out by the fhire of Ayr, to fearch round the 

 coaft of Galloway, in order to find the junction of the granite 

 mountains with the fchiftus or vertical ftrata, of which 1 knew 

 that Galloway confifted. 



We were extremely fortunate in finding what we looked for, 

 in two different places in Galloway ; firft, in the mountain of 

 Cairn's muir, between two and three miles from the Ferry-town of 

 Cree ; and, fecondly, in a little bay upon the fea-fide. about 

 mid-way between Covend and Saturnefs point on the Solway 

 frith. Here we were as much fatisfied, as we had been the year 

 before, that the granite had invaded the fchiftus or Alpine 

 ftrata, having not only broken and floated the fchiftus in every 

 way poflible, but in the laft of thofe two places, we found the 

 granite introduced, for fome length, in fmall veins between the 

 ftratified bodies, giving every mark of the moft fluid injection 

 among the broken and diftorted ftrata. 



In Auguft 1787, I fet out for Arran. Mr Clerk could not 

 go at that time, and Mr John Clerk, junior, was fo kind as 

 to accompany me. We had exceeding good weather for ex- 

 ploring the lofty mountains of that ifland, and returned ex- 

 tremely fatisfied with our expedition. 



I propose to give a particular account of the conftruclioil 

 of Arran, or a mineralogical hiftory of it ; therefore it will here 

 only be neceffary to fay, that I found my former conclufions 

 fully confirmed by all the appearances in this moft interefting 

 ifland ; and I brought fpecimens with me, fome of them of great 



fize, 



*.Tranf. R. S. Edin. vol. I. p. 255. Phyf. CI. 



