CONTENTS OF VOL. XXXVI. — THIRD SERIES. V 



Page 



Geological Prizes 158 



Meteorological Observations for December 1849 159 



Table 160 



NUMBER CCXLIL— MARCH. 



Mr. W. R. Birt on the connexion of Atmospheric Electricity 



with the Condensation of Vapour 161 



Prof. P. Tardy's Observations on a New Equation in Hydrody- 

 namics 171 



Messrs. J. Tyndall and H. Knoblauch on the Deportment of 



Crystalline Bodies between the poles of a Magnet 178 



Mr. S. Beswick's Further Illustrations of a Method for compu- 

 ting Magnetic Declination on the principle proposed by Pro- 

 fessor Gauss 1 83 



The Rev. B. Bronwin on the Theory of the Tides (continued) . . 190 

 Dr. Playfair on the Nitroprussides, a New Class of Salts .... 197 

 Mr. J. Glaisher on the Meteor which appeared on Monday, the 



nth of February 1850, at about 10** 45°> p.m 221 



Professor Powell and Dr. Whewell 235 



Proceedings of the Cambridge Philosophical Society 235 



Meteorite in North Carolina 240 



Gold on the Farm of Samuel Elliot, Montgomery County, Md., 



thirty miles from Baltimore 242 



Gold of California, by C. S. Lyman 243 



On the Oil of Elemi, by M. H. Deville 243 



Action of Nitric Acid on Rhubarb, by M. Garot 244 



Action of Phosphoric Acid on Cholestrine, by M. C. Zwenger 246 



Meteorological Observations for January 1850 247 



Table 248 



NUMBER CCXLHI.— APRIL. 



Mr. J. Glaisher's Additional Observations on the Meteor of 

 February 11, 1850, and Deduction of the Results from all 

 the Observations 249 



Dr. Playfair on the Nitroprussides, a New Class of Salts (con- 

 tinued) 27 1 



Mr. O. M. Mitchell on the Velocity of the Electrical Wave or 

 Current through a Metallic Circuit 284 



Mr. J. Cockle on the True Amplitude of a Tessarine ; on the 

 Derivation of the word Theodolite ; and on Light under the 

 action of Magnetism 290 



Prof. Challis on a new Equation in Hydrodynamics, in Reply 

 to Professor P. Tardy 295 



Mr. Reuben Phillips on the Electricity of Condensation 303 



