196 Dr Buckland on the former Existence of 



Garrie, from Killiecrankie to Blair Athol ; likewise, the vast congeries of 

 gravel and boulders lodged in the shoulders of the mountain opposite the 

 gorge of the Tummel, and accumulated, the author believes, by glaciers 

 which descended the valley of the Tummel, from the north side of Schi- 

 hallion, and the mountains around Loch Rannoch. This elevated mass 

 of moraines and detritus of moraines in the lateral valley of the Tummel, 

 Dr Buckland conceives, was formed across the longitudinal valley of the 

 Garry, in the same manner that modern glaciers of the Alps, — as in the 

 case of the Val de Bagne, — occasionally descend from the transverse 

 across the longitudinal valleys. The mammellated, polished, and striated 

 slate-rocks, about one mile above the falls of Tummel, and forming the 

 left portal of the gorge of the valley, Dr Buckland mentions as proofs of 

 the action of a glacier which descended the gorge : he alludes also to the 

 indications of polish on veins of quartz which project eight or ten inches 

 above the surface of weathered masses of mica-slate, near the same loca- 

 lity ; and to the slight scratches on mammellated rocks at Bohaly, one 

 mile and a half east of Tummel Bridge. The evidence of glaciers on Schi- 

 hallion, he shews, are visible on the north and north-east shoulders of the 

 mountain, in rounded, polished, and striated surfaces, many of which 

 have been recently laid bare in forming a new road. The surface of a 

 porphyry- dike, about forty feet wide, and lately exposed near the thir- 

 teenth milestone on the left flank of the valley called the Braes of Foss, 

 is polished and covered with striae, parallel to the line of descent which 

 a glacier from Schihallion would assume ; and on the right flank of the 

 same valley, one hundred yards north of the eleventh milestone, is an- 

 other smaller vein of red porphyry, similarly polished and striated In the 

 intermediate space, newly uncovered surfaces of hard slate-rocks and 

 quartzite, present phenomena of the same nature, — and the whole of 

 these phenomena are ascribed to the agency of glaciers. The two lofty 

 ridges of gravel in Taymouth Park, ranging at right angles to the sides of 

 the vallev, between the village of Kenmore and the Castle, the mound on 

 which stands the ornamental dairy, and the gravel on which are situated 

 the woo;'s overhanging the left bank of the lower end of Loch Tay, Dr 

 Buckland considers to be moraines, or the detritus of moraines ; likewise 

 the deeply scored and fluted boulders of hornblende rock with other de- 

 bris, which occur at the junction of Glen Moulin with the Lyon. The 

 proofs of glacier-action in Glen Coficld, are shewn to be a remarkable 

 assemblage of moraines upon the high land which divides the valley of 

 the Tay from that of the Bran ; also a group between the sixteenth and 

 fourteenth milestones, consisting of forty or fifty round topped moraines, 

 from thirty to sixty feet high, crowded together like tumuli. It is im- 

 possible, Dr Buckland says, to refer these mounds of gravel and blocks 

 to the action of a current of water, as they are placed precisely at the 

 point where a stream, descending from the high lands, would have acted 

 with'the greatest velocity ; they, moreover, exactly resemble some of those 

 moraines which occur in the valley of the Rhone, between Martigny aid 



