CONTENTS. 



Page 

 Interstitial Water of Rocks. By J. Black, M.D., 

 F.G.S., &c. Communicated by the Author, 38 



VII. On the Colours of the Dew-Drop, with a simple 

 Method of observing them. By the Rev. W. 

 ScoRESBY, D.D., F.R.SS. of London and Edin- 

 burgh, Corresponding Member of the Institute of 

 France, &c. &c. Communicated by the Author, 50 



VIII. Icebergs and Changes of Geological Opinions, 

 Communicated in a Letter from Captain Vetch, 

 F.G.S., &c., of the Royal Engineers, . 56 



Additional Note, 60 



IX. On the Downs of Denmark. By Professor G. 



FoRCHHAMMER of Copenhagen, . . 61 



X. On the Traces of Ancient Glaciers which have 

 filled the Valleys of the Alps of Dauphiny, and 

 on those of the same nature, which appear to re- 

 sult from some of the Observations made by M. 

 Robert in Northern Russia. By M. Renoir. 77 



XI. Notices of Earthquake-Shocks felt in Great Britain, 

 and especially Scotland, with inferences suggest- 

 ed by these notices as to the causes of such 

 Shocks. By David Milne^ Esq., F.R.S.E., 

 M.W.S., F.G.S., &c. Communicated by the 

 Author, ..... 92 



Register of Earthquake-Shocks felt in Great Britain, from 

 the year 1608 to October 1839 ; stating the exact dates 

 of their occurrence, and other particulars, . . 95 



Farther Extracts from Sir Thomas D, Lauder's Account 

 of Earthquake of 1816, 116 



Notes from Newspapers, 117 



XII. Braconnot on Organic Matter in Primitive Rocks, 

 and Brongniart on the Conversion of the Felspar 

 of Primitive Rocks into Porcelain Clay, . 122 



1. — Braconnot on Organic Matter in Primitive Rocks, 122 



2. — Brongniart on the Conversion of th« Felspar of 

 Primitive Rocks into Porcelain Clay, . . 1 23 



XIII. On the Composition of the Air found in the Pores 



of Snow. By M. Boussingault, . 125 



