On the Existence of Glaciers and Icebergs in Scotland. 125 



It is only by a very minute examination of all the specimens which 

 I have had at my disposal, that I have succeeded in accurately de- 

 termining this genus ; it is, however, possible that, among the spe- 

 cimens which I labelled in the English collections, some fragments 

 of Myripristis may occur under the name of Scicenurus. 



We refer our readers, for other details contained in Prof. Agassiz's 

 Report in the " Report of the 14th Meeting of the British Associa- 

 tion for the Advancement of Science, held at York in September 

 1844." 



On the Existence of Glaciers and Icebergs in Scotland at an 

 ancient epoch. With a Map. By Charles Maclaren, 

 Esq., F.R.S.E., &c. Communicated by the Author. 



The shores of Gare Loch, in Dumbartonshire, exhibit the 

 phenomena of grooved and striated rocks probably in higher 

 perfection than any other spot in the British Isles. The 

 grooves and striae, or scratches, are extremely numerous, as 

 well as extremely distinct, and they maintain an invariable 

 character over a considerable area, and in very dissimilar 

 situations. Indeed, when we add what Sir James Hall 

 terms " Dressings," or surfaces, which have been less or 

 more smoothed by abrasion, there is scarcely any part of the 

 district in which the phenomena do not present themselves. 

 Gare Loch is a bay in the Frith of Clyde, situated 25 

 miles below Glasgow. It is about six miles in length, from 

 half a mile to a mile in breadth, and its axis, or a line drawn 

 parallel to its sides, points NNW. and SSE. It is flanked 

 by hills from 400 to 800 feet in height, rising from the 

 strand, sometimes with a moderate, sometimes with a steep 

 acclivity. The gentler slopes are in tillage, up to the height 

 of about 200 feet ; and clumps and stripes of copse wood, 

 commencing at the water's edge, are intermingled with the 

 cultivated land, beyond which lies a wilderness of heath. 

 The eastern shore is embellished with an almost unbroken 

 line of handsome villas and cottages ornees, which are occu- 

 pied during summer by the merchants and manufacturers of 

 Glasgow. The points of Row and Roseneath, which form a 

 sort of double breakwater, shut in the loch, giving it the ap- 



