180 PHYSICAL GEOLOGY. 



2. DENUDATION; GLACIAL PHENOMENA. 



Anon. The Solid Land. Iron^ vol. vi. p. 739. 

 Note on changes of the coast-line. 



Belt, T. Niagara: Glacial and Post-Glacial Phenomena. Quart. 

 Journ. Sci. n. s. vol. v. pp. 135-156. 



Gives the results of his examination of the glacial phenomena of the 

 Niagara gorge, and concludes that the greater part of the gorge was 

 cut out before the glacial period, which therefore need not have ceased 

 so long ago as the opposite conclusion would have implied. F. D. 



Bonney, Rev. T. G-. Glacial Erosion. Geol. Mag. dec. ii. vol. ii. 

 pp. 426-428. 



States objections to certain theories on glacial erosion, on the ground 

 of observations made in various parts of Europe. Considers that the 

 regularity of form of certain valley-sides, and the disproportion be- 

 tween the size of the valley and the stream that flows through it, may 

 be accounted for by subaerial denudation alone, because similar features 

 occur where it is supposed that there has been no ice-sheet at all. 

 Thinks we should find more glacial markings on high ground if the 

 erosive power of ice is as great as some suppose. J. G. G. 



Boue, Dr. A. Ueber die Methode in der Auseinandersetzung geo- 



logischer Theorien und liber die Eiszeit. [The Glacial Theory, &c.] 



Sitz. Jc. Ale. Wiss. Wien, math.-nat. CI. Abth. 1. Bd. Ixxi. 



pp. 199-207. 



Notes on prevalent geological theories, uniformitarianism, &c. The 



author does not believe in glaciation of the tropics ; he gives part of a 



list of 400 papers on the glacial epoch. 



4 Einiges zur palseogeologischen Geographic. [Past Configura- 

 tion of Earth-surface.] Sitz. Tc. Ak. Wiss. Wien, math.-nat. CI. 

 Abth. 1. Bd. Ixxi. pp. 305-425. 

 A review of changes in the form of oceans, continents, lakes, moun- 

 tain ranges, &c. throughout the world, with many references to autho- 

 rities. Under the first head great influence is ascribed to marine cur- 

 rents when the isthmus of Panama was open. E. B. T. 



Einige Bemerkungen uber das Alluvialgebiet. [Alluvium, 



&c.] Sitz. k. Ak. Wiss. Wien, math.-nat. CI. Abth. 1. Bd. Ixxii. 



pp. 100-122. 



A review of facts and opinions relating to various forms of alluvium, 



loess, glacial drifts, &c. ; also to the formation of valleys, particularly 



narrow river-gorges, parallel roads, &c., and to other events which have 



taken place in alluvial times. E. B. T. 



