CONTENTS. 



VIII. On the Rock-Nose of the Whaler, a variety of the 

 Balajiia Mysticetus. By Alex^\.nder H. Guerin 

 of Geneva, Surgeon of the Ship Superieur. Com- 

 municated by the Author 266 



IX. On the Registry of the Hourly Variations of the 

 Thermometer, by means of Photographic Papers. 

 By MuxGO PoNTox, Esq., F.R.S.E., F.R.S.S.A. 

 Communicated by the Royal Scottish Society of 

 Arts, . . \ . ' . . . . 270 



X. Carbonic Acid and Sulphureous Acid Springs — Cold ' 

 Springs — Hot Springs — Mud Volcanoes — Vol- 

 canoes. By Baron Alexander von Humboldt, 277 



XI. On the Composition of Corals and the Production of 

 the Phosphates, Aluminates, Silicates, and other 

 Minerals, by the Metamorphic Action of Hot 

 Water. By J. D. Dana, Esq., ... 293 



XII. Remarks on Professor Pictet's Treatise on Palfpon- 



tology. By Professor Agassiz, . . . 295 



XIII. Observations on the Railways of Belgium. By John 



Anderson, Esq., F.R.S.S.A., (with Two Plates). 

 Communicated by the Royal Scottish Society of 

 Arts, 302 



XIV. On Fossil Fishes, particularly those of the London 



Clay. By Professor Agassiz, . . . 321 



XV. An account of Electrical Experiments. By R. Adie, 



Esq., Liverpool. Communicated by the Author, 327 



XVI. On the Discovery of the Fossil Remains of Bidental 

 and other Reptiles of South Africa. By Andrew 

 Bain, Esq., Surveyor of JMilitary Roads under the 

 Corps of Royal Engineers, .... 333 



XVII. Description of certain Fossil Crania, discovered by 

 A. G. Bain, Esq., in Sandstone Rocks at the 

 South-Eastern Extremity of Africa, referable to 

 different Species of an extinct Genus of Reptilia 

 (Dicynodon), and indicative of a new Tribe or 

 Sub-order of Sauria. By Richard Owen, Esq., 

 F.R.S., F.G.S., &c., 334 



