6 General Monthly Meeting. [Dec. 4, 1854. 



Jopling, R. F. Esq. {the Editor)— The Statist, No. 1. 8vo. 1854. 



Medical and Chirurgical Society^ Royal — Medico-Chirurgical Transactions, 

 Vol. XXXVII. Svo. 1854. 



Nocello, Mr. {the Publisher) — The Musical Times for November and Decem- 

 ber, 1854. 



riwtographic Sbciefy— Journal, No. 24. 8vo. 1854. 



Pollock^ Frederick, Esq. M.A. M.R.I.— YjgXqvi OT^ViSCMldi. 3 vols. 4to. Bero- 

 lini, 1746-51. 



Pollock, Thomas, Esq. (the Author) — On the peculiar State of the Atmosphere 

 during the late Epidemic Cholera and Diarrhoea. 8vo, 1854. 



Price, Rev. Bartholomew, M.A. F.R.S. {the Author) — A Treatise on the Infini- 

 tesimal Calculus. Vol. II. 8vo. 1854. 



Rathbone, Th. W. Esq. {the Author)— VrefdiCe to the Comparative Statement on 

 Decimal Accounts and Coinage. 8vo. 1854. 



Society o/ ^r^s— Journal for November, 1854. Svo. 



Statistical Society— iovLva&l, Vol. XVII. Part 4. Svo. 1854. 



Taylor, Alfred S. M.D. F.R.S. M.R.I, {the Author)— Medical Jurisprudence. 

 5th Edition. 16mo. 1854. 



Taylor, Rev. W. F.R.S. M.R.L— The Magazine for the Blind, December, 

 1854. 

 Wilhelm Von Humboldt — Lichtstrahlen aus seinen Brie fen : mit einer Bio- 

 graphic Humboldts, von Elisa Maier. 16mo. Leipzig, 1852. 

 Ueber das Sehen und die Farben, eine Abhandlung von A. Schopenhauer. 

 Svo. Leipzig, 1816. 



Vereins zur Befordenmg des Gewf.rbfleisses in Preussen — Verhandlungen, 

 September und October, 1854. 4to. 



1855. 



WEEKLY EVENING MEETING, 



Friday, January 19. 



William Robert Grove, Esq. Q.C. F.R.S. Vice-President, 

 in the Chair. 



Professor Faraday, D.C.L. F.R.S. 



On some points of Magnetic Philosophy. 



The magnetic and electric forms of power, being dual in their 

 character, and also able to act at a distance, will probably aid greatly 

 in the development of the nature of physical force generally : and if 

 (as I believe) the dualities are essential to the forces, are always 

 equal and equivalent to each other, and are so mutually dependent, 

 that one cannot appear, or even exist, without the other, the proof 

 of the truth of such conditions would lead to many consequences of 

 the highest importance to the philosophy of force generally. A few 

 brief experiments with the electric power quickly place the dual 



