TO CORRESPONDENTS. 



Communications have been received from Dr. Meyen, J. E. Gray, 

 Esq., Rev. M. J. Berkeley, and Prof. Morren. 



We must request that all Communications or Letters relating to this 

 Journal be forwarded free of expense. 



THE LONDON AND EDINBURGH 

 PHILOSOPHICAL MAGAZINE, and JOURNAL OF SCIENCE: 



CONDUCTED BY 



SIR DAVID BREWSTER, F.R.S., RICHARD TAYLOR, F.L.S., 

 AND RICHARD PHILLIPS, F.R.S. 



Contents of No. d5, for SEPTEMBER 1839. 



ON the Method of producing Copies of engraved Copper- plates by Voltaic Ac^ 

 tion ; on the supply of mixed Gases for Drummond's Light by Electro- 

 lysis ; on the Application of Electro-magnetism as a motive power in Navigation, 

 and on Electro-magnetic currents. By Dr. M. H. Jacobi, in a letter to Mr. 



On the general Solution of Algebraical Equations. By J. W. Lubbock, Esq., 



'Meteorological Observations during a Residence in Columbia between the years 

 1820 and 1830. By Colonel Richard Wright. 



And full reports of the Instructions prepared by the President and Councd of the 

 Royal Society for the Scientific Expedition to the Antarctic Regions. With Pro- 

 ceedings of Learned Societies, numerous Miscellaneous Articles, and Meteorolo- 

 gical Observations and Table. 



SCIENTIFIC MEMOIRS; translated from Foreign Transactions 

 and Journals. Edited by RICHARD TAYLOR, F.L.S. 

 Part VI. with six Plates, price 6s. 

 Containing Melloni on the Polarization of Heat. — Gauss's General Theory of 

 Terrestrial Magnetism. — Gauss on a new Instrument for observing the Intensity 

 of Terrestrial Magnetism.— Weber on the use of the Bifilar Magnetometer.— 

 Schleiden on Phytogenesis. 



The Translations of the Memoirs on Terrestrial Magnetism have been made 

 under the direction and revisal of Major Sabine, Professor Lloyd, and Sir J. F. W. 

 Herschel, with a view to the main object of the Antarctic Expedition under Capt. 

 J. C. Ross. 



The Subscribers who have not received Part V., which contains Memoirs by 

 Jacobi, Gauss, Weber and Rose, are requested to apply for it to their Booksellers, 

 or to R. and J. E. Taylor, Red Lion Court, Fleet Street. 



R. and J. E. Taylor, Red Lion Court, Fleet Street. 



Just Published, Second Edition, and considerably enlarged, with additional Illus- 

 trations, price 4*., 



THE BEE-KEEPER'S MANUAL ; or Practical Hints on the Ma- 

 nagement and complete Preservation of the HONEY-BEE. 



By HENRY TAYLOR. 



London : R. Groombridge, Panyer Alley, Paternoster Row. 



