De Freycinet, Louis Claude de Saulses, 317 De la Hire, Gabriel Philippe, 306 De Prony, M. G., 314 Dryden, Hugh L., 342 Du Buat, L. G., 314 Duperry, Capt. Louis Isidore, 317 Eratosthenes, 306, 308, 342 Eudoxus of Cnidus, 306 Faye, Hervé, 325, 336, 346, 347 Fernel, Jean, 306 Furtwängler, P., 337 Galilei, Galileo, 304, 305, 346 Gauss, C. F., 320 Gautier, P., 339 Godin, Louis, 307 Goldingham, John, 316, 345 Greely, A. W., 329 Gulf Oil and Development Company, 338 Haid, M., 335 Hall, Basil, 316 Heaviside, W. J., 321, 345 Heiskanen, W. A., 338, 345, 346 Helmert, F. R., 338, 339 Helmholtz, Hermann von, 326 Herschel, John, 319, 328, 345 Heyl, Paul R., 339, 342 Hirsch, Adolph, 322, 324 Huygens, Christiaan, 304, 305, 307, 314, 342, 346 Ibañez, Carlos, 325 Jeffreys, Sir Harold, 342 Jones, Thomas, 318 Kater, Henry, 304, 314, 325, 327, 329, 345, 346 Kühnen, F., 338, 339 La Condamine, Charles Marie de, 307, 310, 311, 343 Laplace, Marquis Pierre Simon de, 309, 313, 320 Lorenzoni, Giuseppe, 336, 339 Lütke, Count Feodor Petrovich, 316, 345 Maupertius, P. L. Moreau de, 308, 343 Maxwell, James Clerk, 324 Medi, Enrico, 342 Mendenhall, Thomas Corwin, 319, 331, 332, 334, 347 Mersenne, P. Marin, 305 Newton, Sir Isaac, 303, 307, 308, 342, 343 Norwood, Richard, 306 Oppolzer, Theodor von, 322, 324 Patterson, Carlile Pollock, 325, 326 Peirce, Charles Sanders, 314, 322, 332, 336, 342, 345 Peters, C. A. F., 322, 324 Picard, Abbé Jean, 306, 308, 342 Plantamour, E., 319, 324 Posidonius, 306 Preston, E. D., 328, 329 Putnam, G. R., 339 Pythagoras, 306 Repsold, A., and Sons (Hamburg), 320, 322, 338, 339, 346 Richer, Jean, 307, 342 Sabine, Capt. Edward, 315, 325, 329, 345 Sawitsch, A., 321, 322 Schumacher, H. C., 320 Schumann, R., 335, 336 Snell, Willebrord, 306 Sterneck, Robert von, 331, 332, 335, 338, 346 Stokes, George Gabriel, 324, 328, 329, 345, 346 Ulloa, Antonio de, 308 Vening Meinesz, F. A., 337, 338, 345 Volet, Charles, 342 Wilkes, Charles, 317, 318 * * * * * Transcriber's note: Footnotes have been moved to the end of the paper. Illustrations and the GLOSSARY OF GRAVITY TERMINOLOGY section have been moved to avoid breaks in paragraphs. Minor punctuation errors have been corrected without note. Typographical errors and inconsistencies have been corrected as follows: