CONTENTS. 



NOTICES AND ABSTRACTS OF MISCELLANEOUS 

 COMMUNICATIONS TO THE SECTIONS. 



MATHEMATICS AND PHYSICS. 



Page 



Professor Powell on a new case of Interference of Light 1 



Professor Powell on the Explanation of some Optical Phsenomena ob- 

 served by Sir David Brewster 1 



Professor Powell on certain Points in the Wave-theory as connected 

 with Elliptic Polarization, &c 2 



Mr. Fox Talbot's Remarks on M. Daguerre's Photogenic Process . . 3 



Professor Daubeny on an Apparatus for obtaining a numerical estimate 

 of the Intensity of Solar Light, at different periods of the day, and in 

 different parts of the globe 6 



Professor Forbes's Notice respecting the Use of Mica in polarizing Light. 6 



Mr. James Nasmyth on the bending of silvered Plate Glass into Mirrors 7 



Dr. Andrew Ure on Photometry, or a mode of measuring diffuse day- 

 light comparatively, at any time and place 7 



Mr. J. F. GoDDARD on the use of the Oxy-Hydrogen Microscope in ex- 

 hibiting the phsenomena of Polarization 8 



Sir J. F. W. Herschel's Letter to the Rev. William Whewell, President 

 of the Section, on the Chemical action of the Solar Rays ..... 9 



Rev. Professor Lloyd on the best Positions of three Magnets, in refer- 

 ence to their mutual action 12 



Mr. Addison's Meteorological Observations made at Great Malvern du- 

 ring the years 1835, 1836, 1837, and 1838 14 



Col. Sykes on certain Meteorological Phsenomena in the Ghats of Western 

 India 15 



Mr. FoLLETT Osler's Account of some Indications of the Anemometers 

 erected at Plymouth and Birmingham 17 



Mr. Eaton Hodgkinson on the Temperature of the Earth in the deep 

 Mines of Lancashire and Cheshire 19 



Professor Andrew Ure on a New Calorimeter, by which the heat dis- 

 engaged in combustionmay be exactly measured, with some introductoiy 

 Remarks upon the Nature of different Coals 20 



Professor Stevelly on a method of filling a Barometer without the aid 

 of an Air-pump, and of obtaining an invariable level of the surface of 

 the Mercury in the Cistern 21 



