in Scotland and Parts of England.. 243 



streams as now exist in the Alps. I, in some measure, inti- 

 mated this objection to the British Association in 1850, 

 when, professing to be unprepared for any theory on the sub- 

 ject, I held that one was wanting which would plausibly ac- 

 count for the Pentland phenomena, as also for the uniformity 

 of striation on the front of the Fife hills, on the opposite 

 side of the Forth valley, for I had been shewn markings at 

 Cullelo quarry and near Burntisland, identical in direction 

 with the various examples in Lothian, proving that the whole 

 valley from the Lomonds to the Pentlands, and even beyond 

 these hills, had been under one glacial agent, self-consistent 

 throughout in its movement and operation. 



The observations which I have been able to make since the 

 Edinburgh meeting of the Association have served much to 

 confirm me in the belief, that the views entertained up to 

 that time, for the explanation of the glacial phenomena of 

 Scotland, were far from being adequate to embrace the facts 

 of the case. 



It appears to me that previous observers have, in the first 

 place, had too few facts to speculate upon, and have conse- 

 quently pronounced as if certain local and partial phenomena, 

 such as might arise in a limited Alpine region, were alone to 

 be accounted for. They have also, from a similar limitedness 

 of view, erred in attempting to explain the phenomena as a 

 product of only one set of conditions existing at one point in 

 time. 



As to the real extent of the phenomena in Scotland, the 

 difficulty is not so much to say where there are abraded and 

 striated rocks, more or less covered by glacial detritus, as 

 where such rocks are not. I have, since August 1850, found 

 them along the whole range of the coast north of Argyleshire, 

 namely, in Inverness-shire, and the counties of Ross, Suther- 

 land, and Caithness. I have found them in the Isle of Skye, 

 in situations independent of the Cuchullin Hills : in the island 

 of Mull ; all along Loch Lomond, and Loch Katrine ; even 

 the picturesque eminences which constitute the Trosachs being 

 roches montonnees, with abraded faces to the west. I have like- 

 wise found them in Perthshire, Fife, and Aberdeenshire. They 

 are reported from Ayrshire. I have found a large lateral 



