CONTENTS OF VOL. VIIL 



(FOURTH SERIES.) 



NUMBER XLIX.— JULY 1854. 



Page 



Prof. Tyndall on the Vibrations and Tones produced by the 



Contact of Bodies having different Temperatures 1 



Prof. Buff on the Conductivity of Heated Glass for Electricity. 12 



Mr. A. ]5ay on the Rotation of the Pendulum 19 



Dr. Woods on the probable Nature of the Sun's Body, and on 



a new Process for rendering Collodion more sensitive 24 



Mr. J. C. Adams on Professor Challis's new Theorems relating 



to the Moon's Orbit 27 



Dr. Stenhouse on the Action of Bromine on Nitropicric Acid. , 36 

 Prof. Stokes on certain recent Investigations in the Theory of 



Light 42 



Prof. W. Thomson on the Mathematical Theory of Electricity 



in Equilibrium 42 



Proceedings of the Royal Society 62 



Royal Institution 74 



On the Principles which govern the disengagement of Electricity 



in Chemical Actions, by M. Becquerel , 76 



Meteorological Observations for May 1854 79 



Meteorological Observations made by Mr. Thompson at the 



Garden of the Horticultural Society at Chiswick, near 



London; by Mr. VeaU at Boston; and by the Rev. C. 



Clouston at Sandwick Manse, Orkney 80 



NUMBER L.— AUGUST. 



Prof. A. Connell on a new Hygrometer or Dew-point Instru- 

 ment. (With a Plate.) 81 



Prof. Boole's Reply to some Observations published by Mr. 

 Wilbraham in the Philosophical Magazine, vol. vii. p. 465, 

 on the Theory of Chances developed in Professor Boole's 

 ' Laws of Thought.' 87 



Prof. Boole on the Conditions by which the Solutions of Ques- 

 tions in the Theory of Probabilities are limited 91 



Prof. Challis on certain Questions relating to the Moon's Orbit, 

 in reply to the objections of Mr. Adams 98 



