iv CONTENTS OF VOL. XXX. — THIRD SERIES. 



NUMBER CXCIX.— FEBRUARY. 



Page 

 The Astronomer Royal on Sir David Brewster's New Analysis 



of Solar Light 73 



Mr. J. P. Joule on the EfFects of Magnetism upon the Dimen- 

 sions of Iron and Steel Bars 76 



Mr. J. W. Draper's Remarks on the Existence and Mechanism 



of the Negative or Protecting Rays of the Sun ... 87 



Prof. Powell's Note to a former paper on the Theory of the 



Aberration of Light 93 



Mr. G. Boole's Note on a Class of Differential Equations .... 96 

 Prof. Gianalessandro Majocchi's Observations and Experiments 



respecting the Origin of the Voltaic Current 97 



Mr A W. Hobson on the Equation of Continuity in Fluid Mo- 

 tion ...•• '.• 10* 



The Rev. B. Bronwin on the Integration of some Equations in 



Partial Differentials 107 



Mr. John Southern's Experiments on the Density, Latent Heat 



and Elasticity of Steam 113 



Mr. L. Thompson ou the Exhalation of Bicarbonate of Ammonia 



by the Lungs 124 



Proceedings of the Royal Society 125 



Cambridge Philosophical Society 129 



. Royal Astronomical Society 130 



On Newton's Telescope at the Royal Society 139 



The Central Sun 140 



On the Fermentation of Tartaric Acid and its products. — Bu- 



tyro-Acetic Acid, by M. Nickles . . 141 



On the Ignition of Brass Wire in the ^'apour of Alcohol, by 



M. Reinsch 143 



On the Distillation of Mercury, by M. M. E. Millon 144 



Easy method of prejiaring Iodide of Potassium 146 



Formation of Glycerine, by M. Rochleder 146 



On the Composition of Bohemian Glass 147 



On Oxypicric Acid. — Styphnic Acid 148 



Reduction of the Persalts of Iron by Zinc 149 



Award of Medals. — Linnaean Society 150 



Meteorological Observations for December 1846 151 



Table 152 



NUMBER CC— MARCH. 



Sir David Brewster's Reply to the Astronomer Royal on the 

 New Analysis of SoUir Light 153 



Dr. A.Waller's Additional Observations on Hail, and on the 

 Organic Bodies contained in Hailstones, &c. (With a Plate.) 159 



