Mr. THOMAS BLOXAM on the Influence of Clean and Unclean Surfaces in Vol-
taic Action
Mr. LATIMER CLARK on a new Form of Constant Galvanic Battery.
Dr. J. P. JOULE's Notice of and Observations with a New Dip-circle
Professor TAIT on Thermo-electricity..
Mr. C. F. VARLEY on a Method of Testing Submerged Electric Cables.....
Professor CH. V. ZENGER on a New Key for the Morse Printing Telegraph..
Dr. BUYS BALLOT on the Importance of the Azores as a Meteorological Sta-
tion