vi CONTENTS. 



Page 



M. Quetelet's Memoir of G. Moll, LL.D., Professor of the 

 Physical Sciences in the University of Utrecht, and Member 

 of the Academy of Brussels 288 



Prof. J. J. Sylvester's Note on Definite Double Integration, 

 Supplementary to a former Paper on the Motion and Rest 

 of Fluids 298 



Dr. J. Lhotsky's Notice of a Mineral Spring, Menero Do\vns, 

 N. S. Wales 300 



Proceedings of the Geological Society and Astronomical So- 

 ciety 302—317 



Postscript to the Communication of Prof. Sedgwick and Mr. 

 Murchison 317 



Mr. Crosley's Pneumatic Telegraph 317 



Meteorological Observations. . . 319 



NUMBER XC— MAY. 



Mr, Tovey's Researches in the Undulatory Theory of Light. 



Part II. ; on the Elliptical Polarization produced by Quartz 321 

 Dr. G. Bird's Observations on some of the Products obtained 



by the Reaction of Nitric Acid on Alcohol 324 



Prof. Plateau's Answer to the Objections published against a 

 general Theory of the Visual Appearances which arise from 



the Contemplation of Coloured Objects 330 



Prof. Johnston on the Constitution of the Resins 340 



Mr. Ivory (The Bakerian Lecture) on the Theory of the 



Astronomical Refractions 342 



Prof. Phillips's Remarks on a Note in Prof. Sedgwick and 



Mr. Murchison's Communication in the last Number 353 



Rev. Prof. Sedgwick and Mr. Murchison's Supplementary Re- 

 marks on the " Devonian" System of Rocks 354 



Rev. D. Williams on the Classification of certain Geological 



Formations in Devonshire 358 



Proceedings of the Royal Society, Linnsean Society, Geologi- 

 cal Society, Cambridge Philosophical Society, Royal Insti- 

 tution, Royal Academy of Sciences of Paris 359 — 388 



Lataniutn, a new Metal 390 



Fall of Meteorites at the Cape of Good Hope 391 



Seleniuret of Mercury 392 



Nonexistence of Carbonates of Quina and Cinchonia 392 



Mica containing Potash and Lithia 393 



Rose Mica Lepidohte 393 



Meteoric Iron from Potosi , 394 



Phosphorescent Power of Electrical Light 394 



On the Preparation of Selenic Acid, by H. Rose 396 



Analysis of crystallized Perikline, by Mons. C. T. Thaulon . . 397 

 Cissampelin, a new Vegetable Compound 397 



