CONTENTS. 



NOTICES AND ABSTRACTS OF MISCELLANEOUS 

 COMMUNICATIONS TO THE SECTIONS. 



MATHEMATICS AND PHYSICS. 



Page. 



Mr. Talbot's brief Account of some Researches in the Integral Calculus 1 



Professor Sir W. R. Hamilton on the Calculus of Principal Relations 4 



Professor Stevelly's Illustration of the Meaning of the doubtful Algebraic Sign 



in certain Formulae of Algebraic Geometry 5 



Professor Stevelly on " The Mathematical Rules for constructing Compensating 



Pendulums." 7 



Mr. J. W. Lubbock on the Importance of forming new Empirical Tables for find- 

 ing the Moon's Place 12 



Sir David Brewster on the Action of Crystallized Surfaces upon Common and 



Polarized Light 13 



Sir David Brewster on a singular Development of Polarizing Structure in the 



Crystalline Lens after Death 16 



Mr. J. M'CuLLAGH on the Laws of Double Refraction in Quartz 18 



The Rev. Edward Craig on Polarization 19 



Mr. Wm. Snow Harris on some Phaenomena of Electrical Repulsion 19 



The Rev. J. W. M'Gauley's Series of Experiments in Electro-magnetism, with 



Reference to its AppUcation as a Moving Power 24 



The Rev. W. Scoresby on a New Compass Bar, with Illustrations, by means of 



a recent Instnunent, of the Susceptibility of Iron for the Magnetic Condition 28 

 Professor Forbes's Experiments on Terrestrial Magnetic Intensity, especially in 



relation to the Influence of Height 30 



Professor Phillips on the Direction of IsocUnal Magnetic Lines in Yorkshire... 31 



Professor Lloyd on the Direction of the IsocUnal Lines in England 31 



Mr. Wm. Herafath on the Aurora Borealis 32 



Dr. Traill on the Aurora Borealis of 11th August, 1836 32 



Mr. W. Ettrick's Notice of an Instrument to observe minute Changes of Terres- 

 trial Magnetism 33 



Mr. W. Ettrick's Notice of a new Rubber for an Electrical Machine 33 



Dr. James Apjohn on a new Method of Investigating the Specific Heats of Gases 33 



The Rev. B. Powell on the ImpermeabiUty of Water to Radiant Heat 36 



Mr. R. Addams on the Vibration of BeUs 36 



Dr. Charles J. B. Williams on an Improved Ear-Trumpet... 36 



Dr. Samuel Rootsey on the higher Orders of Grecian Music 37 



