INDEX. 



HALES 



}T ALES, Dr., on gases, 226 ; on water 

 * in plants, 193 



Hall, Mr. C. More, on flint and crown 

 glass, 169 



Hall, Sir J., on melted rocks, 221 



Halle, Dr., pleads for Lavoisier's life, 239 



Haller, early life of, 195 ; his work with 

 students, 196 ; his anatomical plates, 196 ; 

 on contraction of the muscles, 197 ; on 

 comparative anatomy, 197 



Halley, his method of measuring transits, 

 158-162 ; observes transit of Mercury, 

 158 ; predicts the return of a comet, 163 



Harding discovers Juno, 290 



Harvey discovers circulation of the blood, 

 no ; the opposition to his views, 113 ; on 

 development of the chick, 113 



Hawksbee's electrical machine, 123 



Heat, Bacon's examination of, 104 ; early 

 theories about, 329 ; produced by friction, 

 330 ; a vibration, 333 ; latent, 241, 334 ; 

 mechanical equivalent of, 336 ; Joule's 

 experiments on, 335-338 ; conversion of 

 mction into, 332-337 ; converted into 

 motion, 338 ; produciion of electricity by, 

 352 



Heat-rays discovered, 315 



Heavy bodies, Galileo 011 ructions of, 82 



Helmholtz cited, 434 



Hercules, motion of our solar system to- 

 wards, 275 



Hermes and hermetic philosophers, 41 



Hero's engine, 245 



Herophilus on muscles, nerves, and the 

 pulse, 27 



Herschel, SirW., makes his own telescopes, 

 272 ; discovers Uranus and receives a 

 pension, 272 ; on binary stars, 273 ; on 

 star-gauging, 273 ; on nebulae, 274, 327 ; 

 on motion of solar system through space, 

 275 ; discovers heat-rays, 315 ; on cause 

 of sun-spots, 353 



Herschel, Sir J., work in astronomy, 2.95- 

 296 ; on Magellanlc clouds, 295 ; his 

 'Outlines of Astronomy,' 296; on spec- 

 trum analysis, 322 



Herschel, Miss C., her brother's assistant, 

 277 



Herschel, Mr. A., on spectrum of falling 

 stars, 328 



Hiero's crown, Archimedes on, 23 



HiggTns on chemical law of proportions, 



373 

 Hipparchus, astronomy of, 29 ; discovers 



precession of equinoxes, 30 

 I lippocrutes the father of medicine, 14 



IRIDIUM 



Him, M., his experiments' on heat con- 

 verted into motion, 338 

 Hodgson, Mr., on outbreak of a sun-spot, 



355 



Homology, St.-Hilaire on, 394 



Hooke one of the founders of the Royal 

 Society, 125 ; on air-pump, 128 ; on com- 

 bustion, 130 ; on geology, 216 



Horrocks observes transit of Venus, 157 



Huen island, Tycho's observatory on, 78 



Huggins, Dr., on spectrum analysis of the 

 stars, 326 ; of nebulas, 327 



Human anatomy, Vesalius on, 67 



Humboldt, history of, 384 ; on isothermal 

 lines, 385 ; on distribution of plants, 385 ; 

 his 'Cosmos,' 386; on meteors, 297; 

 pays expenses of Agassiz's work, 410 



Hunter, John, his birth and history, 198 ; 

 on comparative anatomy, 198 ; his mu- 

 seum, 199 



Hutton on geology, 219-23 ; on granite 

 veins, 222 ; and Werner, 222 ; on size 

 and weight of Schehallien, 279 



Huyghens, history of, 175; invents cycloi- 

 dal pendulum, 175 ; describes Saturn's 

 ring, 175 ; his undulatory theory of light 

 explained, 175, 181 ; on refraction of 

 light, 178 ; on double refraction, 179 



Huxley on fossil bird-reptile, 424 ; on 

 rapid multiplication of plants, 429 



Hydrogen discovered by Cavendish, 230 ; 

 name given by Lavoisier, 239 ; amount 

 of in water, 372 



ICE, heat lost in melting, 242 ; melted 

 by friction, 333 ; rocks scratched and 



blocks carried by, 413 ; -period in the 



northern hemisphere, 411 

 Iceland spar, double refraction in, 180 

 Igneous rocks, Hutton on, 220 

 Imperial Academy of Germany founded, 



126 



Index of refraction, TO") 

 Indians, early science of, 4 

 Induction-coil, 351 

 Inquisition banishes Vesalius, 63 ; burns 



G. Bruno, 83 ; forces Galileo to recant, 



93 

 Insects, Ray's work on, 144 ; microscopic 



anatomy of, 139 

 Interference of light, 304-6; co'ours caused 



by, 307 



Invertebrate animals, Lanvirck on, 391 

 Ionian school of learning, 8 

 Iridium discovered, 323 



