IN GALLOWAY. 



ments of gneiss in the granite ; and the other is 

 the occurrence of beds of felspar-porphyry in it. 

 A small one of these has been described, as seen 

 in the island at the Castle of Doon, and no fewer 

 than five were observed by us towards the south end 

 of this granite district near Lbch Dee. Some of 

 these beds are very large, of equal dimensions, and 

 of the very same structure and appearance with the 

 beds I described in my former paper, as seen in 

 the transition rocks of the valley of Glenkens. I 

 could in no place observe this porphyritic rock 

 passing into the granite. It seemed in every place 

 to meet it distinctly and abruptly. In some places, 

 the two rocks, at their junction, seemed not even 

 to adhere. 



From the general appearance of the granite^ 

 and its relations to the neighbouring rocks, it ap-- 

 pears to belong to one of the newer formations. 



