GENERAL INDEX. 



M>th-, --of. Pearl micrometers, described .... 

 Mutual of /W/j-v. absolute, relative, uniform, retarded and 

 accelerated, defined ...... 



perpetual, exists only in the heavens 



reflected, explanation, and illustrations of , 



compound, explained ..... 



the earth's annual, produced by the composition of 

 brces . . . . . , 



threefold, of the earth described 



of the moon explained ..... 



of a body may be insensible on account of its great 

 velocity ........ 



Mountains, their attraction of a plummet 



accumulation of water in ... 



Moving bodies, resistance of the air to, how measured 

 Multipliers and doublers of ciectricity 



MURRAY'S proposed scale for a thermometer . . . 

 JM USCHENBROCK'S pyrometer described 

 Muscle and brain, galvanic pile formed by alternate layers of 

 Muscular motions in dead animals produced by galvanism . 



NAIRN'S electrical machine described 



Wattare of light, theories of . . . 



Natural bodies, cause of the colours of ... 



history, microscopes adapted to objects . . 



magnets or loadstones, where found 



Needle, magnetic, see Magnetic Needle, compass, and variation 

 Needle, Dipping, see Dipping-Needle. 

 Negative and positive electricity described 



.. instrument for distinguishing 



Near-sightedness, cause and remedy of pointed out 

 Neutral salts decomposed by the galvanic pile 

 New Holland, colourless topaz of, its use . . . 



NEWTON'S experiments on the oil thermometer 



axioms concerning light .... 



reflecting telescope described . OPT. INST, 



queries concerning the inflection of light . 



scale for determining reflected colours, &c. . 



suggestions of the polarization of light . 



table of the colours of thin plates and films . 



theory of colours ..... 



theorems concerning refraction . 



small, but powerful, magnet, account of . 



discovery of the universality of the principle of 

 gravitation ........ 



NICHOLSON'S instrument for distinguishing negative elec- 

 tricity ......... 



Night telescopes, account of ..... 



Nitric Acid, its effects on copper and on zinc 



NOBILI'S galvanometer described .... 



Non-conductors of electricity described .... 



OAR, its action in rowing a boat described 

 Objects of natural history, microscopes for ... 



(test) for microscopes . . 

 the shadowed side of, by what means visible . 

 manner in which they become visible to the eye . 

 their images inverted on the retina ... 



. vi it dimensions of ... 



jle under which they can be seen . . 

 f<ur ifiicroscopes, formation of . 



resent system of astronomy answered 



's thermometer .... 

 theory of galvanism 

 ory of a single electric fluid 

 's rays a cause of the diminution of their 



Magnetic theories .... 



lalley on light in a diving-bell 



OPT. INST. 

 POP. INT. 



ELECT. 

 THERM. 



GALV. 



ELECT. . 

 NEW. OPT. 



OPT. INST. 

 MAGN. 



ELECT. 



POP. INT. . 

 GALV. . 

 OPT. INST. . 

 THERM. 

 NEW OPT. . 

 15. NEW. OPT, 

 NEW. OPT. . 



ELECT. MAGN. 

 POP. INT. . 



ELECT. 

 OPT. INST. . 

 GALV. . 

 ELECT. MAGN. 

 ELECT. 



POP. INT. . 

 OPT. INST. . 



35 



Page 



57 



. 9, 10 

 . 10 

 1315 

 1518 



. 33 

 . 34 

 50,51 



. 80 



. 6 



. 62 



.17,18 



53 



9 



15 



. 25 

 19 



15 



. 9 

 54 



. 47 

 . 1 



. 13 



27,28 



. 96 



15 



. 25 



. 5 



. 11 



1030 



. 63 



. 46 



64 



. 52 



. 31 



. 33 



55 



39 



'27 



POP. INT. 



OPT. INST. 

 POP. INT. 



THERM. 

 GALV. . 

 ELECT. . 



POP. INT. 

 MAGN. 

 NEW. OPT, 



28 

 . 10 

 14 



42,43 

 5,6 



. 13 



47 

 . 49 



77 



. 77,78 



. 78, 79 



. 79 



80 



. 46, 47 



3739 



8 



32 

 13,64 



46,47 

 . 96 

 .38 



