PHYSICAL GEOLOGY. 177 



A version in Swedish of Dr. Heim's paper on this subject contributed 

 to the publications of the Swiss Alpine Club. The theories of Seheuchzer 

 Hugi, Grad, Agassiz, Moseley, Croll, Forbes, Ball, Rendu, J. Thomson, 

 Tyndall, Biaconi and Matthews, Helmholz, Tresca, and Albert Heim 

 (ranging from 1733-1870) are summarized in the above order. 



G. A. L. 



Heim, A. Einiges iiber die Yerwitterung der Berge. [Weathering of 

 mountains.] Neujahrsblatt, Zurich. 



Assigns the denudation of mountains to the action of wind, lightning, 

 rain, vegetation, and variations of temperature. The effect of these 

 upon the different kind of rocks is examined. G. A. L. 



Hella-nd, Amfxd. Om Maegtigheden af Braeerne i Norge under 

 Istiden. [Thickness of the glaciers of Norway during the Glacial 

 period.] Geol. ftiren. Stockholm Forhandl. bdt. ii. pp. 168-177. 

 Describes the appearance of Norway during the glacial epoch thus : — 

 The fjords were filled with glaciers, which attained a height of 1700 to 

 1800 metres in the Sogne Fjord, and 1200 metres in Hardanger Fjord. 

 The tributary fjords contained glaciers as much as 800 metres in thick- 

 ness. The neve extended to or covered mountain-peaks 1700 or 1800 

 metres high in the Inletinden, and yet higher up the Tron-ljeldet and 

 Rendals-Scilen, and had at least a thickness of 800 to 1100 metres. 

 The ice-mass also covered South-eastern Norway, where it had a thick- 

 ness of at least 600- to 700 metres. E. E. 

 Henderson, John. On glacial phenomena in the Pentland Hills, 

 and at Tynecastle, near Edinburgh. Trans. Edin. Geol. Soc. 

 vol. ii. i)art 3, pp. 360-367. 

 Discusses various points connected Avith Glacial theories, as illus- 

 trated by phenomena in the neighbourhood of Edinburgh. 



Igelstrom, L. J. Exempel pS- flyttblock, som ligga hiigre iin deras 

 moderklyft. [Example of a boulder lying higher than its mother 

 rock.] Geol. foren. Stockholm Forhandl. bdt. i. pp. 151, 152. 

 Note of occurrence west of Krappa, in Wermland. 



o 



Jespersen, M. Asar. Geol. Mag. dec. 2, vol. i. p. 574. 



Thinks that the melting of an ice-sheet wdll go on fastest when the 

 ice passes over depressions in the ground, specially those with running 

 water, and that towards such places there would be a flowing in of 

 the ice around to make good the loss ; so that much detritus would bo 

 accumulated at such spots, either at the bottom, or in the ice, or on its 

 surface. This detritus is carried on by the motion of the ice-sheet, to 

 be finally heaped up as ridges (a,sar) along the course the whole has 

 taken. Allows also that some 8.sar are banks heaped up by the sea 

 along old coast-lines. A. H. G. 



Kjehulf, Prof. Theodor. Om Jaettegryder. [On Giants' Kettles.] 

 Foredrag paa det 11 Skand. Naturforskcrmodo Kjbbenhavn, 1873. 

 With plate and map. 



Kettles in the valley of the Gula river (South Trondhjem), throe of 

 1874. N 



