Réaumur, 238 recurrence, 37 Regnault, 170 relativity, 83, 305, 417, 423, 498, 505 Richard, 477-8, 480-1 Riemann, 56, 62, 145, 212, 239, 243, 381, 432 surface, 211, 287 Roemer, 233 Röntgen, 511, 520 rotation of earth, 225, 331, 353 roulette, 403 Rowland, 194-7, 305, 489 Royce, 202 Russell, 201, 450, 460-2, 464-7, 471-4, 477-82, 484-5 St. Louis exposition, 208, 320 Sarcey, 442 Saturn, 231, 317 Schiller, 202 Schliemann, 19 science, 205, 321, 323, 340, 354 Science and Hypothesis, 205-7, 220, 240, 246-7, 319, 353, 452 semicircular canals, 276 series, development in, 287 Fourier's, 286 Sirius, 226, 229 solid bodies, 72
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