CONTENTS. in 



PAGE 



XIII. On the Internal Pressure to which Rock Masses may- 



be subjected, and its possible influence in the Pro- 

 duction of the Laminated Structui-e. By W. Hop- 

 kins, M. A., F.R.S., 115 



XIV. The Volcanoes of Central France not in a State of 



Activity in the Age of Julius Csesar, . .110 



XV. Notes of a Botanical Excursion, with Pupils, to the 

 Mountains of Braemar, Glenisla, and Clova, and 

 to Benlawers, in August 1847- By J. H. Bal- 

 four, M.D., Professor of Botany in the University 

 of EdinburgliN Communicated by the Author, 122 



XVI. On the Glaciers and Climate of Iceland. By W. Sar- 



TORius VON Waltershausen, . . .129 



XVII. Description of a Portable Cofferdam, adapted specially 

 for the use of Harbour and other Marine Works 

 in exposed situations. By Thomas Stevenson, 

 F.R.S.E., F.R.S.S.A., Civil Engineer, Edinburgh, 

 (With a Plate.) Communicated by the Royal 

 Scottish Society of Arts, .... 140 



XVIII. Of the Source of Motions upon the Earth, and of the 

 means by which they are sustained. By Robert 

 E. Brown, M.D., Edinburgh. Communicated by 

 the Author, 148 



XIX. Account of the Pi'oceedings of the Geological Society 

 of France for 1847- By Sir Henry de la Beche, 

 President of the Geological Society of London, 155 



XX. On the Decomposition and partial Solution of Mme- 



rals, Rocks, &c., by Pure Water, and Water 

 charged with Carbonic Acid. By Professor W. B. 

 Rogers, and Professor R. E. Rogers, of the Uni- 

 versity of Virginia, . . . . .163 



XXI. Proceedings of the Royal Society of Edinburgh, . 169 

 XXII. Wernerian Natural History Society, . . . 174 



