708 



INDEX. 



Howard, I. 535, 722, II. 



155,498, 502,674. 

 Hoyle, II. 673. 

 Hube, II. 128, 465, 539. 

 Hubius, II. 360. 

 Hurldart, I. 182, 183, 481, 



II. 187. 

 Huebner, II. 492. 

 Huepsch, II. 480. 

 Hugenius, II. 112. 

 Huilier,II. 119. 

 Hulk, II. 243. 

 Human strength, II. 165. 

 Human voice, I. 400, II. 



266, 275. 

 Humboldt, 1. 498, II. 514. 

 Humidity, I. 709. 

 Humming top, I. 402. 

 Hundred weight, H. 161. 

 Hunter, II. 311, 517, 573, 



597. 

 Hunter's screw, I 72, 



208. 

 Hurdy gurdy, I. 399. 

 Huret, II. 157. 

 Hurricane, 11. 457. 

 Hurricanes, II. 458. 

 Hutchinson, II. 239. 

 Huth, II. 172. 

 Hutton, I. 364, II. 110, 



112, 113, 115, 118, 121, 



128, 152, 177, 229, 322. 



407. 

 Huygenian theory, II. 679. 

 Iluygens, I. 190, 192, 248, 



253, 277, 357, 358, 366, 



443, 445, 458 . . 460, 



462, 477, 479, 480, 482, 



483, 492, 517, 567, 598, 



604, II. 112, 136, S06, 

 r 320, 509, 541, 556, 614, 



619, 622, 623, 630. B. 



1629, D. 1695. 

 Hydra, I. 724. 

 Hydracontistcrium, 11.247. 

 Hydraulic air vessels, I. 



336. PI. 23, 



Hydraulic architecture, I. 



308,312,11.232. 

 Hydraulic bellows, I. PI. 



24,11: 253,254. 

 Hydraulic forces, 1.316, If. 



235. 

 Hydraulic instruments, H. 



245. 

 Hydraulic machines, 1.327, 



II. 245, 247, 264. 

 Hydraulic mean depth, II. 



61. 

 Hydraulic measures, I. 318. 

 Hydraulicostatics,I. 300. 

 Hydraulic pendulum, II. 



247. 

 Hydraulic pressure, I. 59, 



300,357,11.62,226. 

 Hydraulic ram, 1. 337, PI. 



23, II. 249. 

 Hydraulics, I. 258, 277, 



352, II. 60, 221, 263. 

 Hydraulic siphon, II. 249, 



251. 

 Hydraulic wheels, II. 237. 

 Hydraulum, IL 275. 

 Hydrodynamic measures, 



II. 235. 

 Hydrodynamics, I. 255, II. 



57, 219. 

 Hydrogen gas, II. 256, 265, 



279, 509, 541. 

 Ilydrographical charts, II. 



374. 

 Hydrology, II. 342, 368, 



479. 

 Hydrometer, 1.309. PI. 21, 



11.231.419. 

 Hydrometrical fly, I. 318, 



PI. 22. 

 Hydrostatic balaiice, 1. 308, 



PI. 21,11. 159. 

 Hydrostatic equilibrium,!!. 



57. 

 Hydrostatic instruments, I. 



308, II. 231. 

 Hydrostatic lamp II. 245. 



Hydrostatic machine, II. 



237. 

 Hydrostatic paradox, I. 



263. 

 Hydrostatic press, I. 322. 

 Hydrsstatic pressure, I. 



663. 

 Hydrostatics, I. 257 . . 



259, PI. 19,11.219. 

 Hyctometcr, II. 476. 

 Hygrology, II. 464. 

 Hygrometer, 1. 709, 753, PI. 



4), 11.465,468,474. 

 Hygrometry, 1. 751, II. 465, 



469. 

 Hygroscopes, II. 468. 

 Hypatia, I. 352. 

 Hyperbola, I. 623, II. 121, 



122, 123,381,681. 

 Hyperbolical logarithms, II. 



8. 

 Hyperbolical pipes, II. 266. 

 Hyperbolic cylindroid, II. 



122, 123. 

 Hyperbolic fringes, I. P1.30, 



II. 643. 

 Hyperbolic glasses, II. 283, 



384. 

 Hyperbolic rainbow, !I. 



309. 

 Hyperbolic sectors, n. 119. 

 Ilyperoxygeniied muriatic 



acid, II. 673. 

 Ilypocycloid, II. 122, 558, 



562. 

 Hypotenuse, H. 13. 

 Hypotheses, II. 613. 

 Hypotheses of electricity, I. 



658. 

 Hypotrochoid, H. 558. 

 Ibn Junis,I. 191,595,604. 

 Ice, I. 444, 577, 699, 746, 



II. 86, 216, 221, 293, 



385, 394, 395, 410, 411, 



479, 480, 509, 511. 

 Ice boat, II. 342. 

 Iceland, II. 498. 



Iceland crystal, 1. 445, 477, 



PI. 29, II. 309, 435, 511, 



629, 679. 

 Ice melted, I. 634. 

 Iconantidiptic telcscope,II. 



286, 351. 

 Idioelectrics. See Electrics. 

 Igneous meteors,!. 722, II. 



499. 

 Ignis fatuus, I. 435, II. 



499. 

 Ignited charcoal, II. 25^^. 

 Illumination, I. 423, II. 77, 



291, 312. 

 Illumination of the planets, 



I. PI. 34. 

 Illustrations of astronomy 



and geography, II. 374. 

 Image, I. 418, 423, PI. 



27, 28, II. 71, 73, 281. 

 Image on the retina, I. 



448, PI. 30, II. 82. 

 Imaginary quantities, II. 



114'. 

 Images, II. 283. 

 Imisou, II. 129. 

 Immersion of thermometers, 



II. 388. 

 Impact, II. 136. 

 Impelling boats, II. 243. 

 Impelling ships, II. 242. 

 Impenetrability, I. 609. 

 Impenetrability of matter, 



I. 28. 

 Imperfections of sight, H. 



315. 

 Impossible quantities, U. 



114. 

 Impossible roots, II. 1 15. 

 Impregnation, II. 518. 

 Impregnation of seeds, U. 



514. 

 Impulse, II. 51. 

 Impulseof abullet, II. 136. 

 Impulse of a fluid, I. 59. 

 Impulse of a jet, I. 301. 

 Impulse of a vein, 11. 227. 



