PHYSICAL GEOLOGY. 175 



Datta, J. D. Glacial phenomena in Nicaragua. Amer. Joum. ser. 3, 



vol. vii. pp. 594, 595. 

 An expose and critique of Mr. Belt's views (see p. 172). 



Fhazee, p., Jun. On the Exfoliation of Rocks near Gettysburg, 



Proc. Amer. Phil. Soc, vol. xiv., No. 93, pp. 295-297. 

 Notices peculiar Aveathering of Syenite-boulders in that part of the 

 battle-field called the Devil's Den. 



FiiosT, J. [nom do plume]. Behaviour of Glaciers and Ice-sheets. 



Geol. Mag. dec. 2, vol. i. p. 576. 

 Asks a question as to the reversed movement of ice in the higher part 

 of an ice-sheet. 



Geikie, Prof. Archibald. Introductory Address. Trans. Edin. 

 Geol. Soc. vol. ii. part 3, pp. 247-267 (published separately imder 

 the title ' Earth Sculpture and the Huttonian School of Geology '). 



A general re\iew of the doctrines held by the modern Huttonian 

 School of Geologists as to the origin of mountains and the subject of denu- 

 dation, but more especially a critical review of the views of the Duke 

 of Argyll upon these questions (in his Presidential Address to the 

 Geol. Soc. London). Enters in detail into the opinions of the Duke as 

 to the origin and formation of several of the valleys and mountains of 

 the Highlands, and maintains the correctness of the opposite views. 

 Criticises the views expressed in the Duke's paper "On Six Lake-basins 

 in Argyllshire" (Quart. Journ. Geol. Soc. 1873). H. A. N. 



Geikie, James. The Great Ice-age and its Relation to the Antiquity 

 of Man. 8vo. Lend. Pp. xxiii, 575, plates xvii, and 5Q woodcuts. 



The author adopts and illustrates in detail the generally received 

 view as to the order of events in Britain during the last Glacial epoch : 

 viz. that first there was a period of intense cold ; then a milder period, 

 during which the British Isles were submerged ; and then a second cold 

 period, less severe than the first. His new points are as follows : — He gives 

 additional evidence of mild intervals during the first glaciation. He 

 shows that there was a submergence of about 260 feet towards the end 

 of the first cold period, and that, as the ice-sheet became broken up 

 into separate glaciers, these brought down morainic rubbish, part of 

 which was shot into the sea and formed the Upper Boulder Clay, as 

 distinguished from the Till, of Scotland ; part was shed on land. He 

 believes also that many erratics were not carried by icebergs, but were 

 dropped by the ice-sheet as it melted. 



The great submergence of the country did not follow immediately on 

 the disappearance of the ice-sheet ; there was an interval, during which 

 great masses of gravel were piled up on land by floods produced by the 

 melting of the ice. Then began the great submergence, during which 

 these gravels were rearranged by the sea, and Kames were formed. 



On the question of the antiquity of man, the author insists on tho 

 absence of any traces of a transition from the Palceolithio to the Ncoli- 



