[24] The German word _Kette_ has been translated as "circuit" throughout. Although the equivalence of these words is clear, for example, in Ohm's work of 1826, the context in which _Kette_ is sometimes used in 1820 and 1821 indicates that the concept of a "circuit," in the sense of the wiring external to the source of electricity, has not been established. The wiring is regarded more as something incidental, used to "close" the cell, the cell being considered essentially the whole of the apparatus. This view underlies the many attempts to correlate the Oersted phenomena with cell materials and design, and with the use of such terms as "chemical magnetism" by Erman and others. [25] The reference here is to the Oersted-type experiments described in two papers by authors other than Schweigger on pages 19 to 34 of the volume. [26] Op. cit. (footnote 19), pp. 422-426. [27] One "line" seems to have been about 1/12 inch. [28] J. G. POGGENDORF, "Physisch-chemische Untersuchungen zur naeheren Kenntniss des Magnetismus der voltaischen Saeule," _Isis von Oken_ (1821), vol. 8, pp. 687-710. Most of Poggendorf's numerical data is also in C. H. PFAFF, _Der Elektromagnetismus_ (Hamburg, 1824), along with some of Pfaff's own work. [29] Reported in _Annales de Chimie et de Physique_ (1820), vol. 15, pp. 222-223. [30] "On the Development of Electro-Magnetism by Heat," _Transactions of the Cambridge Philosophical Society_ (1823), vol. 2, pp. 47-76. [31] "Account of the New Galvano-Magnetic Condenser invented by M. Poggendorf of Berlin," _Edinburgh Philosophical Journal_ (July 1821), vol. 5, pp. 112-113. * * * * * U.S. GOVERNMENT PRINTING OFFICE: 1964 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402--Price 20 cents INDEX Aldini, Giovanni, 124 Ampere, Andre Marie, 127, 129 Arago, Dominique Francois Jean, 129 Bennet, Abraham, 124 Berzelius, Joens Jakob, 133 Bettany, G. T., 136 Biot, Jean Baptiste, 135 Carlisle, Anthony, 124 Cavallo, Tiberio, 124 Cavendish, Henry, 123 Cummings, James, 125, 127, 133 Erman, Paul, 128, 129, 132, 133 Faraday, Michael, 125 Galvani, Luigi, 124 Gay-Lussac, Joseph Louis, 125 Gilbert, L. W., 127, 132 Meineke, ----, 128 Nicholson, William, 124 Oersted, Hans Christian, 125, 132 Ohm, Georg Simon, 123, 135 Oken, Lorenz, 132 Pfaff, Christian Heinrich, 132 Poggendorf, Johann Christian, 127, 132, 136 Raschig, Christoph Eusebius, 129 Ritter, Johann Wilhelm, 129 Savart, Felix, 135 Schweigger, Johann Salomo Christoph, 127, 132, 136 Seebeck, T., 128, 135 Soemmering, S. T., 125 Speter, M., 127, 128 Thenard, Louis Jacques, 125 Tromsdorff, Johann Bartholomacus, 125 Van Marum, Martin, 123 Volta, Alessandro, 123, 124, 127 Wollaston, W. H., 125 Zamboni, Giuseppe, 132 Transcriber's Corrections. Obvious typographical errors have been corrected as follows: