INDEX. 



633 



LOO 



Loomis's invention, 537 

 Love of knowledge, necessity of 

 regulating a, 21, 



of fame as a stimulant to re- 

 search, 291 



of truth, feebleness of our, 110 

 Ludolf 's discovery in electricity, 



533 



Lyell's discovery in geology, 601- 

 602 



"If AGIO LANTERN, invention of 

 111 the, 527 



Magnet and electric wire, rotation 

 of, 537 



discovery of the influence of a 

 voltaic current on a, 570 



proximity of metals 



on the movements of a, 570 



Magnetic capacity and atomic 

 number, connection between, 

 583 



changes in iron by means of 

 heat, discovery of, 519 



declination, discovery of the 

 change .of, 518, 570 



inclination, discovery of, 538, 

 570 



influence of the sun, discovery 

 of the, 570 



intensity, invention for detect- 

 ing changes of, 537 



needle, discovery of the effect 

 of the aurora on the, 570 



variation of the, 518 



stations and observations, dis- 

 covery by means of, 575 



repulsion, discovery of, 494, 570 



rotation of polarised light, dis- 

 covery of, 561,562 



heat, discovery of, 543 



storms, discovery of, 570, 578 



of the great extent of, 

 575, 582 



storm, instance of a, 578 



variation, discovery of diurnal 

 and yearly, 577 



is not uniform, discovery 



that, 570 



MAN 



Magnetisation by atmospheric 

 electricity, discovery of, 539 



of iron by position alone, dis- 

 covery of, 570 



of light, discovery of, 226 



of steel by means of a voltaic 

 current, 537 



by means of atmospheric elec- 

 tricity, 539 



Magnetised bodies, discovery of 

 general expressions for attrac- 

 tions and repiilsions of, 606 



Magnetising iron rods, discovery 

 of a mode of, 537 



Magnetism, discoveries in terres- 

 trial, how effected, 575 



discovery of, 494 



of its effect on crystals, 562 



the ' voltaic arc,' 

 561 



relation to an elec- 

 tric current, 536-537 



hypothesis of universal, 511, 

 538 



is diminished by heat, discovery 

 that, 539 



of electric currents, Ampere's 

 discovery of the, 593 



produced by lightning, dis- 

 covery of, 570 



relative direction of an electric 

 current to, 536-537 



universal, 494, 511, 538, 549, 

 561-562, 585 



variation of according to dis- 

 tance, discovery of, 481 



Magneto-electric current, pro- 

 duced by heat, discovery of, 

 229 



electricity, discovery of, 493, 

 522-523, 537, 548, 594 



Magnetometer, invention of a, 

 486 



Magnets, invention of bifilar sus- 

 pension of, 485 



Malpighi's discoveries, 476 



Malus's discoveries, 224-225,528- 

 529, 566, 590 



Man, the most ancient ancestors 

 of, 604 



