Vill CONTENTS. 



Page 

 Replies by Mr. E. M. Clarke, the Rev. Professor Callan, and 

 Dr. Ritchie to certain Papers on Subjects of Electricity and 

 Magneto-electricity inserted in the preceding and present 



volumes of the Philosophical Magazine 455 



Proceedings of the Linnaean Society 464? 



Geological Society 471 



— — — Zoological Society 479 



■ at the Evening Meetings of the Royal Institution 485 



Cambridge Philosophical Society 485 



— Royal Irish Academy 487 



Mr. T. A. Knight upon the supposed Absorbent Powers of the 

 Cellular Points, or Spongioles, of the Roots of Trees and 



other Plants 488 



On the Action of Presence, by M. Pelouze 489 



On Catalysis and the Action of Presence, by M. Berzelius . . 490 



M. Leveill6 on the Hymenium of Fungi 492 



On the Ascent of the Sap 494 



Magnetic Observations of the Aurora of February 18th 494 



On the Decomposition of Carbonate of Lime by Heat 496 



M. Bussy on the Preparation of Iodine 498 



M. Bussy on the Preparation of Bromine 499 



M. Mulder on the Red and White Oxide of Phosphorus 499 



Action of Iodine on the Vegetable Alkalis 50o 



Meteorological Observations 503 



PLATES. 



I. A Plate illustrative of Mr. Brooke's Paper on the Crystallographical 

 Identity of certain Minerals; and also of M. von Siebold's Paper 

 on the Sj/ngamus trachealis. 



II. A Plate illustrative of the Papers by Mr. J. Young and Mr. Warren 

 De La Rue on their respective New Voltaic Batteries. 



III. A Plate illustrative of Mr. Brooke's Paper on the Identity of two 

 Minerals from Vesuvius named Biotine and Anorthite, &c. 



ERRATA. 

 P. 165, 1. 26, for cake read coke. 

 279, 1. 5, /or Bavaria read Baveno. 

 394, 1. 18, /or sulphurets read sulphates. 

 417, 1- 21 from the bottom, and p. 418, 1. 11, /or Pelouse read 



Pelouze. 

 419, 1. 19, for " the country," read " this country." 

 422, 1. 19 from the bottom, /or " as just described, read "as de- 

 scribed in p. 418." 



