CONTENTS. V 



Page 



Dr. Faraday's Experimental Researches in Electricity. — 

 Eighth Series {continued) 171 



Dr. J. Apjohn's Formula for inferring the Dew-point from the 

 Indications of the Wet-bulb Hygrometer 182 



Rev, Baden Powell's Abstract of the essential Principles of 

 M. Cauchy's View of the Undulatory Theory, leading to an 

 Explanation of the Dispersion of Light j with Remarks 

 {continued) 1 89 



Prof. T. Everitt's (Economical Means of procuring pure the 

 Salts of Manganese, and of analysing the Minerals which 

 contain Manganese and Iron, &c 193 



Mr. C. Blackburn's Analytical Theorem relating to Geometri- 

 cal Series 1 96 



Mr. G. O. Rees on the Presence of Titanic Acid in the Blood 201 



J. B. on the Attraction of an Homogeneous Ellipsoid on an 

 external Particle 203 



Prof. J. D. Forbes on the Refraction and Polarization of Heat 

 {continued) 205 



New Books: — Parkes's Chemical Catechism, by Brayley .... 214? 



Proceedings of the Linnsean Society 220 



Royal Astronomical Society 221 



. Zoological Society ! 223 



Mr. Sturgeon on an Aurora Borealis seen at Woolwich on 

 December 22, 1834. 230 



Mr. Gill on the Structure of the Fibres of Flax and Cotton, in 

 Reference to the Observations of Mr. Bauer 231 



Dr. Gale on Professor Mitchell's Method of preparing Car- 

 bonic Oxide 232 



Carbonate of Stronlia discovered in the United States — Sepa- 

 ration of some Metallic Oxides 234 



Separation of Oxide of Cadmium and Oxide of Bismuth — Ac- 

 tion of Muriate of Ammonia on certain Sulphates 235 



Peroxide of Iron as an Antidote to Arsenious Acid 237 



Improved Compass- Needles — Analyses of Osmiridium and 

 Allanite 238 



Mr. F. Watkins's Observations on Mr. Sturgeon's Letter con- 

 tained in the Lond. and Edinb. Phil. Mag. for November 

 1834. 239 



Meteorological Observations 240 



NUMBER XXXIV.— APRIL. 



Mr. Brayley 's Notice of a Memoir on the Natural Laws 

 which appear to regulate the Distribution of the Powers of 

 producing Heat and Light among the different Groups of 

 the Animal Kingdom 241 



