I 



PHYSICAL GEOWGY. 173 



The views of 31. CoUomb on the respective parts played by denuda- 

 tion and faulting in the production of the physical configuration of a 

 country are given. H. A. N". 



Brogger, \y. C, and H. H. Reusck. Giants' Kettles at Christiania. 

 Quart. Journ. Geol. Soc. vol. xxx. p. 750. See also Sexe, p. 95. 



Describes the Giants' Kettles as deep well-shaped pits in gneissose 

 rocks, circular or sometimes elliptical in section, and with spiral 

 groovings on the sides. They are filled in with moraine matter at the 

 top ; and below this there is a collection of regularly rounded stones 

 and sharp irregular gravel. The kettles, it is suggested, may have 

 been formed beneath an ice-sheet by surface-streams of water, which 

 plunged down moulins and ground out a vertical shaft in the rock 

 beneath the ice by the aid of the large rounded stones now found at 

 the bottom of the kettles. A. H. G. 



Brown, D. J. On some of the Glacial Phenomena of the neigh- 

 bourhood of Edinburgh, as observed in the Pentlands, Blackford 

 Hill, Bruntsfield Links, and Tyncastle Sandpit. Trans. Edin. 

 Geol. Soc. vol. ii. part 3, pp. 351-357. 

 Notes facts indicating the occurrence of local glaciers in the Pent- 

 land Hills, and describes the glacial phenomena observed at the other 

 localities mentioned. H. A. N. 



On a New Theory for the Formation of Till or Boulder Clay. 



Trans. Edin. Geol. Soc. vol. ii. part 3, pp. 383-389. 

 Discusses the views generally entertained as to the mode of forma- 

 tion of Till or Boulder Clay, and propounds the theory that it owes its 

 origin to glaciers, but only where these protrude into the sea. H. A. N. 



Campbell, J. F. About Polar Glaciation. Quart. Journ. Geol. Soc. 

 vol. xxx. pp. 450-478. 



Refers to his extensive observations of glacial markings, and to a 

 paper (Quart. Journ. Geol. Soc. xxix. p. 19S) in which he gives a modi- 

 tied adhesion to the theory of a polar ice-cap, and states that the object 

 of the present paper is to point out how far subsequent observations 

 bear out the views there maintained. lie cannot see his way to a 

 general ice -cap reaching nearly to the equator, but believes there was an 

 extension of the polar glaciation down to lat. bQ)° in the east of Europe, 

 55° in Germany, 50° in Britain, and 39"^ in N. America. A. H. G. 



Carpenter, Dr. W. B. On the Physical Cause of Ocean Currents. 

 Phil. Mag. ser. 4, vol. xlvii. p. 359. 



A reply to Mr. Croll's papers, pp. 94, 1G8, of the same volume. 



Cdambrun de Rosemont, a. de. Sur la decomposition des doloraies 



de la cote de Nice sous rinflucnce des vagucs. [W^eatherings by 



the waves of the dolomites of the coast of Nice.] Bull. Soc. Geol. 



France, 3 ser. t. ii. pp. 219-221. 



A description of the action of the waves near Capo Ferrat and at 



the Baousse-Rosso rocks near Mentonc, on certain Jurassic dolomites. 



The surface of these rocks appears to bo covered by a kind of varnish of 



