CONTENTS. V 



Page 

 Mr. W. Sturgeon on the Theory of Magnetic Electricity (con- 

 tinued) i 201 



Rev. H. Lloyd's Further Experiments on the Phenomena pre- 

 sented by Light in its Passage along the Axes of Biaxal Cry- 

 stals 207 



Mr. J. Prideaux on the Theory of Voltaic Action (continued). . 210 

 Mr. R. Murphy's Further Demonstration of the Existence of a 



real or imaginary Root for any proposed Equation 220 



Mr. J. Robison's Suggestion regarding the Improvement of 



Lighthouses 221 



Proceedings of the Linnaean Society 222 



Royal Astronomical Society 222 



Zoological Society 230 



Mr. R. Potter's Observations on two Arches of Aurorae Bo- 



reales 233 



Analysis of Gums 234? 



Examination of Sugar of Milk 235 



Supposed Artificial Malic Acid 236 



M. Pelouze on the Chemical Agency of Water , 237 



Summary of the State of the Barometer, &c. in Kendal, for 1832 238 



Occultations of fixed Stars by the Moon, in March 1833 239 



Meteorological Observations 240 



NUMBER X.— APRIL. 



Rev. J. Yates's Notice of a Submarine Forest in Cardigan Bay 241 

 Mr. J. Scrymgeour's Narrative of Experiments made with the 

 Seconds Pendulum, principally in order to determine the 

 hitherto unassigned Amount of the Influence of certain mi- 

 nute Forces on its Rate of Motion (continued) 244 



Mr. J. Prideaux on the Theory of Voltaic Action 251 



MM. Wisniewsky and Tarkhanof's Abstract of Meteorological 

 Observations made at St. Petersburg, in 1830, at the Astro- 

 nomical Observatory; and calculated by Prof. M. A.Kupffer 260 



Mr. J. Barton on the Inflexion of Light 263 



Prof. T. Graham on the Law of the Diffusion of Gases (con- 



tinued) 269 



Mr. R. Potter's Reply to the Remarks of Professors Airy and 

 Hamilton on the Paper upon the Interference of Light after 



passing through a Prism of Glass 276 



Rev. T. J. Hussey's Catalogue of Comets (continued) 282 



Prof. W. R. Hamilton on the undulatory Time of Passage of 



Light through a Prism 284 



Mr. R. Murphy on the Real Functions of Imaginary Quantities 287 



Mr. R. B. Bate on an Improvement in Medal Ruling 288 



Proceedings of the Royal Society 291 



Geological Society 300 



Linnaean Society 307 



