20 GENERAL INDEX. 



v Page 



Exhibition of electric light from charcoal .... GALV. * \ 10 



Expansibility of glass rods and tubes, table of . . THERM. . 53 

 Expansion, relative, of different metals, from the freezing to 



the boiling point of water, table of < , . . 20 



of seven different metals, table of . . 17 



. . . . of seven different solids, table of . . . 27 



of spirit and mercurial thermometers, tables of , 53 



of various bodies by heat, tables of . . . 61, 62 



Experiments on Iceland spar by Bartolinus . . . NEW. OPT. . 9 



on the decomposition of light . . . . 11,12 



on the inflexibility of light .... . 20,22 



on the inflexion of light ' . . . . . 60 



. . on the images of concave mirrors . . . OPT. INST. . 



... on burning mirrors . . 3 



on the phenomena exhibited by thin transparent 



plates NEW. OPT. . 40, 41 



on galvanism bv Roget .... GALV. . 30, 31 

 on the mutual attraction of electric currents by 



Roget . . ELEC. MAG. . 59 



Explosion, lateral, of electricity ..... ELECT. . . 41 



Eye, anatomical description of . . POP. INT. 94. NEW. OPT. . 3 



. . preserves the impression of light for a time . . . 35 



. . how objects are rendered visible to the, illustrated . POP. INT. . "77, 78 



Eye-piece, Ramsdeii's micrometical .... OPT. INST. . 14 



FACTS and general principles of magnetism . . . MAGN. . . 1 16 



FAHRENHEIT'S mercurial thermometer described . . THERM. . 7 



scale, principle of its division . . . 



Reaumur's and Celsius's scales, formulae for 

 converting into degrees of each other ..... 



Falling of a magnet on a stone pavement impairs its power 

 . . ^bodies, resistance of the air. on .... 

 . . . . experiments on . . . . . 



the earth rises to meet . ... 



FARADAY'S electro-magnetic experiments . . 



Fatal experiment of Professor Richman . . . 



. . consequences of the local. attraction of vessels . 



FERGUSON'S pyrometers described ... 



Ferruginous bodies, not the only ones susceptible of magnetism 



Fibres for micrometers, various kinds of ... 



Figures of bodies, illustrations of .... 



Fishes, electric shocks received from several kinds of . 



Fits of easy reflection and transmission of light 



FITZGERALD'S metalline thermometer .... 



Fixed stars, their distance and bulk unknown , 



Florentine Academy, their improvement of the thermometer 



Fluid, electric. [See Electric Fluid.'] .... 



microscope described ..,,.. OPT. INT. 



Fluids, methods for inclosing objects in for observation . 



.. magnetic, theory of two , . MAGN, . { 



. . heat considered as one of them . POP. 1 



. . cause of their rise in capillary tubes . . ' 



. . mechanical properties of . . , . . 



. . effects of gravity more observable in than in solid 



/ todies . . . . . . . ., . . 



.. gravitation and pressure of, explained . , . . 



. . elastic, mechanical properties of . . . 



.. differ in their chemical properties . . 



Fly-wheel, its mode of action explained . ... . POP. L^ 



Foci of lenses, calculation of . . . . . OPT. I> 



" . . geometrical and refracted, distinction between . 



Fog, why the sun appears red through one . . . POP. a 



Force, definition of . . , . r~ 



. . centrifugal, centripetal, and tangential, distinguished 



Forces, composition of, laws of Ti 



how they produce the earth's annual 



motion ....... ' -ft- 



. . . magnetic, laws of ,...* MAGNJI ^ 



. .. intensity of, in relation Jo distance . 4-.j 



t . method of determining their intensities ' 



