536 ISLE OF MAN. GEOLOGY. GRANITE. 



junction of the granite and the schist, nor can it be 

 determined whether the former substance is part of a 

 fundamental mass or an exposed portion of a vein. On 

 this subject it can only be remarked, that the structure of 

 the granite is even, and small grained; and that it re- 

 sembles in general aspect those which are known to form 

 fundamental rocks ; being totally unlike that which, in 

 Scotland at least, is found in independent veins, and 

 which is there always characterized by a peculiarity of 

 structure. In describing the alluvial rocks, it was already 

 hinted that the granite might possibly extend to a much 

 greater height in the mountain; from the great number 

 of rolled pieces and angular fragments which are found 

 in a position far superior, and which are identical 

 in structure with it, while they at the same time differ 

 materially from those demonstrably transported blocks 

 found in different parts of the island. Hereafter perhaps, 

 some accidental increase of a mountain torrent may, by 

 sweeping off the alluvial covering, lay bare a larger extent 

 at a higher elevation, and confirm this conjecture. 



Although the actual contact of the schist and granite is 

 no where visible, there are indications present to show 

 that this contact is probably not remote from the spot 

 where the latter appears. In the rolled fragments are 

 found pieces of schist entangled in the granite; which, 

 when large, preserve their usual character, and when 

 small, put on the aspect of micaceous schist : minute frag- 

 ments of these are even found in the fixed rock. I have 

 already mentioned this phenomenon as occurring in Mull, 

 in Rannoch, in Braemar, and in Glenco. In all these 

 cases, this appearance is limited to the vicinity of the 

 schist ; and it thus becomes probable, that here also, the 

 junction of the schist and the granite takes place in 

 the vicinity of the Doon river. 



Felspar and mica predominate in the composition of 

 this granite ; the quartz is in small quantity. The felspar 

 is of a brownish hue, and the mica is white or grey. In 



