Geological Society. 517 



three communications : the first detailing the observations of M. 

 Agassiz and Dr. Buckland conjointly during a recent tour in Scot- 

 land ; the second recording Dr. Buckland's observations in Scotland, 

 Northumberland, Cumberland and Westmoreland ; and the third 

 containing evidences of glacial action collected by Mr. Lyell in 

 Forfarshire and the valley of Strathmore. 



The phaenomena in Scotland, wherein M. Agassiz and Dr. Buck- 

 land recognized the evidences of glacial action, consist in the union 

 of rounded, polished, striated and furrowed surfaces with morains 

 and transported blocks, analogous to the similarly associated phaeno- 

 mena upon the Jura and in the Alps. They are described in the six 

 following localities. 1st, the morains on the summit level of the road 

 between Inverary and Loch Awe : 2ndly, the rounded, polished and 

 striated surfaces of granite near the water's edge at the ferry of Bun- 

 awe, and the morains adjacent to it near Mucairn: Srdly, the polished 

 and striated surfaces of granite, between high and low -water, at 

 the ferry of Ballahulish on Loch Leven : 4thly, the rounded, po- 

 lished and striated surfaces, accompanied by morains, in Glen Roy 

 and the valley of the Spean ; from the position of which they infer 

 that the lake, to which many writers have referred the origin of the 

 parallel roads of Glen Roy, was caused by two glaciers descending 

 from Ben Nevis across the valley of the Spean, in the same manner 

 as in 1818 a temporary lake was formed by a barrier of ice in the 

 Val de Bagnes above Martigny ; and as at this time, a barrier formed 

 by the glacier of Miage protruding across the AUee Blanche is the sole 

 cause of the Lake Combal, which would immediately be left dry like 

 Glen Roy, should any cause remove the protruding barrier of the 

 glacier of Miage* : a fifth locality, in which there is the same con- 

 current evidence of morains loaded with transported blocks, and of 

 rounded and polished surfaces on the sides and bottom of a moun- 

 tain valley, occurs near Sir George Mackenzie's residence at Coul, 

 at the south-west base of Ben Wevis : the 6th and last locality visited 

 conjointly was the site and neighbourhood of the town of New 

 Aberdeen, where the polished surface of the granite had been no- 

 ticed by Dr. Fleming, and where remodified detritus of morains 

 fonns the hillocks of gravel between the town and the sea on the 

 north side of the estuary of the Dee, and cliffs of gravel and till or 

 boulder clay occur on the south of the same estuary. 



In another communication Dr. Buckland records his observation 

 of similar phaenomena in the valley of Strathmore; in the highland 

 valleys of the Tay and Tumel ; on the north-east shoulder of Schie- 

 hallion ; in the high pass of Glen Cofield, between Tayniouth and 

 Strathearn; in Glen Lednoch and Glen Turret, on the north of 

 Comrie ; on the sides of Loch Earne ; and in the valley of the Tcith 

 between Loch Katerine and Doune. 



In the lowland districts he notices also the occurrence of rounded, 

 polished and striated surfaces upon the top of the basaltic rocks 

 of Stirling Ca-stle, on tlie north i'ace of the Castle Rock at Edin- 

 burgh, at Blackford hill, on Calton hill, the Costorphin hills, and 

 * Sec Captain Basil Hall's Patchwork, vol. i. p. 1 1'l. 



