CONTENTS. iii 



Art. XVIII. On the Scenery of Italy, as contrasted with that of 

 Germany ; the Geognosy of Albano, near Rome ; 

 and the General Structure and Trachytic Rocks 

 of Etna. In a Letter of Professor Friedtricm 

 Hoffmann to M. Gerhard at Berlin, - 370 

 XIX. Analysis of a singular Substance found among the 

 Products of the Eruption of Vesuvius in the 

 winter 1830. By William Gregory, M. D., 

 F. R. S. E. Lecturer on Chemistry, &c. Com- 

 municated by the Author, _ - - 378 



XX. Notice of Captain Alexander's Journey in America. 



In extracts of a Letter to Professor Jameson, 380 



XXI. Notice of a late eruption of Vesuvius, in a Letter 



from Thomas Jameson Torrie, to Professor 

 Jameson, _ _ - - 384 



XXII. Description of several^ New or Rare Plants which 

 have lately flowered in the neighbourhood of 

 Edinburgh, and chiefly in the Royal Botanic 

 Garden. By Dr Graham, Professor of Botany 

 in the University of Edinburgh, - 387 



XXIII. Celestial Phenomena from April 1. to July 1. 1832, 

 calculated for the Meridian of Edinburgh, Mean 

 Time. By Mr George Innes, Astronomical 

 Calculator, Aberdeen, - - - 388 



XXIV. Proceedings of the Wernerian Natural History 

 Society. (Continued from preceding Volume, 

 p. J92.), . - - - 391 



NEW PUBLICATIONS. 



1. Fauna Boreali Americana; or the Zoology of the Northern 



Parts of British America. Part Second — The Birds. 

 By William Swainson, Esq. F. R, S., F. L. S., and John 

 Richardson, M.D.,F.R.S.,F.L.S. 4to. Murray, Lon- 

 don, 1831. ----- 392 



2. Principles of Geology. By Charles Lyell, Esq. F. R. S. 



Vol. II, Murray, London, 1832, - - 395 



3. The Fossil Flora of Great Britain, or Figures and Descrip- 



tions of the Vegetable Remains found in a Fossil State 

 in this Country. By Professor Lindley, and Mr Wil- 

 liam HuTTON of Newcastle. Ridgway, London, 1831, 

 in 8vo. numbers, - - - - 396 



