CONTENTS 



Page 

 Art. I, Memoir of William Roscoe, Esq. By Dr Thomas 



Stewart Traill, F. R. S. E., &c. Communicated 

 by the Author, - - - - igs 



II. On the Mode of determining Fossil Plants. By Pro- 

 fessor LiNDLEY, - - - _ 221 



III. On the Vitality of Toads. By the Rev. Edward 



Stanley. F. L. S., F. G. S., &c. Communicated 

 by the Author, . . - - 228 



IV. On a Production of Naphthaline in an Oil-Gas Appa- 



ratus. By A. CoNNELL, Esq. F. R. S. E. Com- 

 municated by the Author, - - 231 

 V. On the Character and Affinities of certain Genera, 

 chiefly belonging to the Flora Peruviana. By Mr 

 David Don, Librarian of the Linnean Society; 

 Member of the Imperial Academy Naturae Curio- 

 sorum : of the Imperial Society of Naturalists at 

 Moscow ; of the Royal Botanical Society of Ratis- 

 bon; and of the Wernerian Society of Edinburgh, 

 &c. (Continued from No. for Oct. 1831, p. 280.) 233' 



VI. Observations on the Structure and Development of 



the Infusoria. By Dr Rudolph Wagner, of Er- 

 langen, ----- 245 



VII. An Exposition of some of the Laws and Phenomena 



of Magnetic Induction, with original Illustrative 

 Experiments. By the Rev. William Scoresby, 

 F. R. S. Lond. & Edin., Correspondent of the Insti- 

 tute of France, &c. &c. Communicated by the 

 Author, - - - - - 257 



VIII. Additional Observations on the Relation of Nitric 

 and Nitrous Acids to Bromine and Iodine. By 

 Arthur Connell, Esq. F. R. S. E., &c. Commu- 

 nicated by the Author, - - 283 



