Hachette, _b._ 350. Hadley, _a._ 474. Haidinger, _b._ 330. Halicon, _a._ 150. Haller, _b._ 401, 466. Halley, _a._ 354, 355, 396, 398, 421, 426, 435, 443, 450, 454, 480; _b._ 225. Haly, _a._ 222. Hamilton, Sir W. (mathem.), _b._ 124, 130. Hampden, Dr., _a._ 228. Hansen, _a._ 372, 374. Hansteen, _b._ 219. Harding, _a._ 448. Harris, Mr. Snow, _b._ 209. Harrison, _a._ 473. Hartsoecker, _a._ 474. Harvey, _b._ 446, 449, 456. Hausmann, _b._ 329. Haüy, _b._ 320, &c., 325, 342. Hawkesbee, _b._ 193, 195. Hegel, _a._ 415. Helmont, _b._ 262. Henckel, _b._ 318. Henslow, Professor, _b._ 474. Heraclitus, _a._ 56. Herman, Paul, _b._ 379. Hermann, Contractus, _a._ 198. Hermann, James, _a._ 359, 362, 363; _b._ 386, 387. Hermolaus Barbarus, _a._ 75. Hernandez, _b._ 379. Herodotus, _a._ 57; _b._ 361, 506. Herophilus, _b._ 441. Herrenschneider, _b._ 145. Herschel, Sir John, _a._ 467; _b._ 67, 81, 254, 333, 555, 559. Herschel, Sir William, _a._ 446; _b._ 80. Hevelius, _a._ 450, 471, 480. Higgins, _b._ 287. Hill, _b._ 319, 403. Hipparchus, _a._ 144. Hippasus, _a._ 107. Hippocrates, _b._ 438. Hoff, K. E. A. von, _b._ 545, 550. Hoffmann, _b._ 527. Home, _b._ 518. Homer, _b._ 438. Hooke, _a._ 324, 353, 354, 387, 395, 396, 401, 406; _b._ 29, 41, 62, 77, 79, 85. Hopkins, Mr. W., _b._ 40, 557. Horrox, _a._ 276, 303, 395. Hoskins, _a._ 355. Howard, Mr. Luke, _b._ 179. Hudson, _b._ 403. Hugo of St. Victor, _a._ 231. Humboldt, Alexander von, _b._ 219, 523, 538, 549. Humboldt, Wilhelm von, _b._ 240. Hunter, John, _b._ 476. Hutton (fossilist), _b._ 519. Hutton (geologist), _a._ 456; _b._ 515, 584. Huyghens, _a._ 337, 343, 353, 357, 377, 387, 412; _b._ 33, 62, 70, 86, 87. Hyginus, _a._ 168. Iamblichus, _a._ 214. Ideler, _a._ 113. Ivory, _a._ 372. Jacob of Edessa, _a._ 209. Jameson, Professor, _b._ 338, 514. Job, _a._ 124. John of Damascus, _a._ 206. John Philoponus, _a._ 206. John of Salisbury, _a._ 232, 234. John Scot Erigena, _a._ 229. Jordanus Nemorarius, _a._ 314, 331. Joseph, _a._ 226. Julian, _a._ 215. Jung, Joachim, _b._ 384. Jussieu, Adrien de, _b._ 407. Jussieu, Antoine Laurent de, _b._ 406. Jussieu, Bernard de, _b._ 406. Kæmpfer, _b._ 379. Kant, _b._ 490. Kazwiri, _b._ 583. Keckerman, _a._ 235. Keill, _a._ 367, 426; _b._ 264. Kelland, Mr. Philip, _b._ 127, 130. {28} Kempelen, _b._ 47. Kepler, _a._ 263, 271, 290, 353, 383, &c., 415, 462; _b._ 55, 56. Kircher, _a._ 218. Kirwan, _b._ 274, 278. Klaproth, _b._ 279. Klingenstierna, _a._ 475; _b._ 67. Knaut, Christopher, _b._ 386. Knaut, Christian, _b._ 386. König, _b._ 519. Krafft, _b._ 142, 225. Kratzenstein, _b._ 166. Kriege, _b._ 380.