II. CONTENTS. 



Art. VIII. Account of M. Foiirnet's Opinions regarding the 

 Metamorpbic Changes of Rocks, and his Ob- 

 servations on tlie Systems of Elevation in the 

 country near Arbresle (Depart, du Rhune). 

 Contained in a Report made to the Academy 

 of Sciences of Paris. By MM. Elie de Beau- 

 mont, Bequerel, and Alex. Brononiart, III 



IX. Remarks on the Scenery, Antiquities, Popula- 

 tion, Agriculture, and Commerce of Central 

 European Turkey. By Dr A. Boue'. Com- 

 municated by the Author in a letter to the 

 Editor, .... 121 



Part I. — Scenery and Antiquities. 



X. On the Cause of the Temperature of Hot and 

 Thermal Springs ; and on the bearings of this 

 subject, as connected with the general question 

 regarding the Internal Temperature of the 

 Earth. By Professor Gustav Bischopt of 

 Bonn. Communicated by the Author. (Con- 

 tinued from Vol. XXIII, p. 330), . 132 



Part II. — Are the observations hitherto made] in Mines 

 sufficient to determine tiie law of the increase of 

 mperature towards the centre of the Earth ? 132 



Chap. XII. — What influence do the meteoric waters exert 



on the internal temperature of the Earth? . 132 



XIII. — What influence have thermal springs on the 



temperature of the interior of the Earth ? . 1 34 



XIV. — What influence has the air on observations of 



temperature in mines ? . . .136 



XV What influence has climate on the progression of 



the increase of temperature towards the centre of 

 the Earth? ..... h^jg 



XVI. — The unequal power of conducting heat, pos- 

 sessed by different rocks, causes differences in the 

 progression of temperature towards the centre of 

 t lie Earth? . . .140 



XVII. — Can the increase of temperature towards the 

 interior of the Earth follow the same law in .ill 

 parts of the Earth, departing from points all si- 

 tuated in the same level ? . • 1 42 



