180 PHYSICAL GEOLOGY. 



R£vY, J. J. Hydraulics of Great Rivers. The Parana, tho Uru- 

 guay, and the La Plata Estuaries. London. 

 Richardson, Ralph. On River Denudation, with Observations on 

 the course of the Esk at Hawthorn den, the Muriestone Water, 

 Midcalder, &c. Trans. Edin. Geol. Soc. vol. ii. part 3, p. 313, 

 plate. 

 Adduces instances of the erosion of river-valleys by their contained 

 streams. The paper is illustrated by a lithograph, showing the erosion 

 caused by the river Esk at Hawthornden. H. A. N. 



. Notice of a Section in the Building Excavations at Tjme- 



castle, West End, Edinburgh. Trans. Edin. Geol. Soc. vol. ii. 

 part 3, pp. 358-360. 



Describes a section of various glacial deposits (28 feet). 



. Notice of a large Quartz Boulder, called the " White Stone,'* 



in the town of Peebles. Trans. Edin. Geol. Soc. vol. ii. part 3, 

 pp. 397-399. 



Contains a description of the boulder and a record of its history. 



Tardy, — . Les Glaciers et le Soleil. [Glaciers and the Sun.] 

 Bull. Soc. Geol. Erance^ 3 ser. t. ii. pp. 207, 208. 



Note protesting against M. Yicaire's view that the Glacial period is 

 to be explained by the cooling of the sun, resulting from its combus- 

 tion. G.A.L: 



. Action de la Mer sur quelques Roches. [Action of the sea 



on some rocks.] Bull. Soc. Geol. Erance, 3 ser. t. ii. pp. 267, 268. 



Believes that a certain blackish vitreous varnish, occasionally found 

 coating hard rocks exposed to the weathering action of breakers, can 

 be effected only by sea- water. G. A. L. 



Torneeohm, a. E. Nagra amnorkningar med antedning af Dr. P. A. 

 Levin's uppsats " Tankar om de skandinaviska sandasarnes bild- 

 ning." [Remarks on Dr. Levin's " Suggestions on the Eormation 

 of the Scandinavian Sand-ridges " (see p. 178.] Geol. foren. Stock- 

 holm Eorhandl. bdt. i. pp. 55-60, pi. iv. 



' . Nagra iakttagelser med afseende pa flyttblocken i Jemtland. 



[Erratics in Jemtland.] Geol. fdren. Stockholm Eorhandl. bdt. i. 

 pp. 80-84. 

 Account of observations as to the directions in which the erratic 

 blocks of this region have been transported. G. A. L. 



. Om fiyttblock och terrasser vid Rendals-Solen i Norge. [Er- 

 ratic blocks and terraces near Rcndals-Solen, in Norway.] Geol. 

 foren. Stockholm Eorhandl. bdt. i. pp. 106-109. 



Weiser, R. Permanent Ice in a Mine in the Rocky Mountains. 



Amer. Journ. ser, 3, vol. viii. pp. 477, 478. 

 The writer can only account for the production of this ice by falling 

 ** back upon the Glacial era of the Quaternary." 



