36 



GENERAL INDEX. 



r, peculiar, proceeding from a worked electrical ma- 

 chine . . .*..*. 

 OERSTED, history of electro-magnetism prior to his disco- 

 veries ........ 



account of his discoveries .... 



his electro-magnetic theory 

 Oi^-thermometer, Newton's improvements on 

 OPACITY of bodies, probable cause of ... 



Opaque microscopes, description of .... 



Opera-glasses, achromatic description of ... 



Opinions of the ancients respecting the cause of magnetic aU 

 traction ........ 



Optics and optical instruments, books upon 



popular introduction to ..... 



Orbits of the planets proportionally represented 

 Oxidability of different metals, tables of ... 



PARABOLOIDAL surface proper for the mirrors of reflecting 

 microscopes ........ 



PARKER'S large burning-mirror described 



Particles, minute, of bodies, separated by pores . . 



Pearl (mother of) micrometer ..... 



Percussion, artificial magnets made by ... 

 Periscopic combination of lenses .... 



microscope described ..... 



spectacles ....... 



Perpetual motion exists only in the heavens 

 Phantasmagoria, that exhibition explained 

 Phenomena of the rainbow, different theories of 



examined and investigated by 

 Aristotle and Euclid ...... 



of refraction accurately investigated by Ptolemy 

 of coloured rays, description and laws of . 



prismatic, singular account of ... 

 exhibited by thin transparent plates . . 



observable in the passage of the electric fluid 



on the passage of the electric fluid 

 through a vacuum ....... 



of intermitting springs accounted for . 

 Photometer and hygrometer, description of ... 



improvements in, suggested 

 PHOTOMETERS, different, by Leslie, described 

 Physiological effects of galvanism .... 



Pile, galvanic, discovery of ...... 



. . formed by layers of muscle and brain 



formed of vegetable substances . . 

 Piles, galvanic, secondary formation of ... 



battery formed by a combination of . 



Pith-balls, experiments with, on electrical attraction and 

 repulsion ........ 



Planets, probability of their being inhabited by rational beings 

 general account of ..... 



* . their orbits and diameters proportionally represented 

 primary, why the satellites revolve round them 

 vicissitudes of seasons in .... 



Plates, galvanic electricity not dependent on the magnitude 

 of their surfaces ....... 



thin, thick, &c. colours of .... 



tables of ... 

 Platina pyrometer described ..... 



phenomena exhibited on its combustion 

 PLATO, his knowledge of the equality of the angles of inci- 

 dence and reflexion. ...... 



Plummet attracted by mountains 



Plus and minus degrees of the thermometer, inconvenience of 

 Pneumatics, popular introduction to .... 



Polarisation of light first suggested by Newton . . 

 Polarity of a magnity described and illustrated 

 Pole of a magnet made to revolve round a vertical wire t 



ELECT. 

 ELECT. MAGN. 



THERM. 

 NEW. OPT. 

 OPT. INST. 



MAGN. 

 OPT. INST. 

 POP. INT. 



GALV. 



OPT. INST. 

 NEW. OPT. 



MAGN. 

 OPT. INST. 



Page 

 . 25 



. 14 



. 46 



7981 



. 5 



. 63 



50 



. 24 



. 33 



. (JO 



74100 



35 



22,23 



15 

 17 

 53 



57 



42 

 41 



42 



9 



10 



52 



2 

 . 2 



. 41 



. 38 



3941 



2328 



25 



. C3 



39,40 



45 



4244 



17 



4 



25 



. 25 



27 



5 



1720 



33,36 



3340 



35 



34, 35 

 48 



GALV. . .10 



NEW. OPT. 3941,5254 



POP. INT. 

 OPT. INST. 

 NEW. OPT. 



ELECT. 



POP. INT. 

 THERM. 



GALV. 



GALV. 



POP. INT. 



THERM. . 

 GALV. 



NEW. OPT. 

 POP. INT. 

 THERM. 

 POP. INT. 

 NEW. OPT. 

 MAGN. 



. 29, 30 

 11 



1 



9 



6573 



64 



1,2 



ELECT, MAGN. IS 2 



