628 



INDEX. 



GUN 



Gunter's discovery of change of 

 magnetic declination, 570 



Gypsum, discovery of at Nether- 

 field, 518 



HAECKEL'S inference respect- 

 ing the ' Olynthus Calca- 

 reous Sponge,' 604 

 Hales's discovery of the mineral 

 constituents of plants and ani- 

 mals, etc., 540 

 Hall's invention of achromatic 



lenses, 477 

 Halley's comet, discovery of, 228 



discovery of the fixed boiling- 

 point of water, 479 



Haphazard experiments, 426 



Harding's discovery of an asteroid, 

 509-510 



' Harmonic analyser 'of Sir W. 

 Thomson, 607 



Harmonic vibration, discovery re- 

 specting, 565 



Harris's application of the light- 

 ning conductor to ships, 537 



Harvey, persecution of, 256 



Harvey's discovery of the circu- 

 lation of the blood, 219, 509, 

 541, 571 



great industry and perseve- 

 rance, 255-256 



Haiiy's discoveries, 535, 545, 567- 

 568, 581, 598 



Hawksbee's improvement of the 

 electric machine, 480 



Hearing, limits of our sense of, 

 320 



Heat, discovery by examining the 

 effects of, 553 



of latent, 529-530 



of the mechanical equiva- 

 lent of, 531 



evolved by contact of liquids 

 with solids, discovery of, 555 



evolved by friction, experi- 

 ments respecting, 496, 530 



evolved by molecular change 

 of iron, discovery of, 519, 548 



its complex effects, 33-34 



HUY 



Heat,Melloni's discoveries respect- 

 ing radiant, 228, 479, 531, 548, 

 574 



of the sun, its great amount, 32, 

 610 



-v rotation of a metal ball by, 494 



Henkel's enthusiasm in science, 

 258 



Henry's electrolysis of acids and 

 ammonia, 483, 554 



Herschel, Sir J., discoveries by, 

 516-517, 545, 582 



prediction of discovery of 



continuity of liquid and gaseous 

 states, 230-231 



suggestion of spectrum ana- 

 lysis, 590 



Herschel's, Sir J., criterion of 

 truth, 153, 155 



Herschel's, Sir W., discoveries, 

 476, 511, 547-548, 582, 587 



scientific character, 252 



Sir J. and Sir W., discoveries 

 respecting nebulae, how effected, 

 560 



Hipparchus's discoveries, 565, 577, 



608 

 Histology, discoveries in, how 



made. 579 

 Homologous series, discovery by 



assuming the existence of, 524 

 Hooke's discoveries, 529, 537, 586 



prediction respecting the law 

 of action of gravity, 176-177 



Hoorweg's discovery respecting 



the diathermancy of aqueous 



vapour, 544 

 Hopkins and others' discovery of 



some of the effects of enormous 



pressure, 559-560 

 Humboldt's discoveries, 570, 571 

 Hunter's experiments, cost of, 220 



great industry and persever- 

 ance, 255-256 



Button's discovery of the specific 

 gravity of a mountain, 586-587 



Huyghens's application of the 

 pendulum to clocks, 474 



discoveries, 224, 489-490, 510, 

 566, 573, 589 



