INDEX. 



Adie, Richard, on the connection between the colour of substances 



and their magnetic properties, 209. 

 -^rolites, shower of, 181. 

 Agassiz, Professor, on the natural history of the naked-eyed mediisse 



or jelly fishes, 85 — his American Zoological Journal announced, 



184 — on classifications in zoology, 227. 

 Address delivered at the Anniversary Meeting of the Geological 



Society of London, on the 15th February 1850, by the Pre- 

 sident, Sir Charles Lyell, F.R.S., &c., &c., 1. 

 America, its first discovery — observations on, 90. 

 Analogy between the mode of reproduction in plants, and the 



•* Alternation of Generations **' observed in some radiata, 266. 

 Anderson, Thomas, M.D., on a remarkable compound of iodine and 



codeine, 103 — On a new mineral named Gurolite, 367- 

 Arsenious acid, on interesting changes of its internal structure when 



in a solid state, 346. 

 Auriferous districts of Wicklow, account of, by William Mallet, 



Esq., 82. 

 Barrande, Joachim, on the Silurian system of Bohemia, by Professor 



Nicol, 107. 

 Blind fish of the Mammoth cave of Missouri, account of, by Professor 



Agassiz, 254. 

 Buist, Dr, of Bombay, his account of floods in India, 52 — on the 



general vibration or descent and upheaval of the land over the 



northern hemisphere, 322. 

 Carbon, its tetramorphism considered, by Henry Clifton Sorby, Esq., 



F.G.S., &c., 149. 

 Carbonic acid exhalations, researches on, by Professor Bischoff, 1 82. 

 Central heat of the earth, observations on, by Stevenson Macadam, 



Esq., 127 — on the cause of the phenomena exhibited by the 



Geysers of Iceland, 222. 

 Climate of New Zealand, alleged change of, 182. 

 Cull, Richard, M.D., his remarks on three Naloo negro skulls, 40. 

 Delesse, Professor, on the rose-coloured syenite of Egypt, 260. 

 Dynamic equivalent of current electricity, and on a fixed scale for 



electromotive force in galvanometry, by William Petrie, Esq., 



64. 



