GENERAL INDEX. 



Magnetic forces, relations of their intensities to distance . 



methods of determining their intensities 

 . method of measuring .... 



at different heights above the earth's surface 

 . . induction analogous to electric induction 

 complex, experiments on . 

 means of quickening the progress of 

 iron, attraction and repulsion of ... 

 susceptibility and retentiveness, less in iron than in 



33 



M.u;x. 



steel 

 cools 



power of steel, below a certain heat, increases as it 



of iron, or steel, retained in proportion to 

 the hardness , 



table of different species 



curves, their remarkable properties and method of 

 delineating ........ 



batteries, concerning ..... 



instruments, description of various . 

 . . equator, explanation of the term . . . 



needle, its proper proportion, weight, &c. . 



on the dip off. ..... 



aifected by the Aurora Borealis 



affected by lightning, so as to reverse its 

 polarity . . . . . . . 



how affected by electro-magnetism 

 its movements in free space . 

 , its properties exhibited by a helical coil 



suspended in the air without a visible agent 

 effects of thermo-electric currents upon . 

 properties of circular conductors exhibited 

 Magnifier*, Friar Bacon's description of ... 



Magnifying j)Q\\eY of lenses, table of . . . . 



of sapphire lenses, table of . 

 of telescopes and microscopes, method of 

 determining . . . . . 



Magnitude of the corpuscles of bodies investigated . 

 Man, why he can see himself at full-length in a plane mirror, 

 which is only half his height ..... 



Mariners' compass, construction of ..... 



Mars, account of that planet . . . . 



Materiality of electricity, experiments in proof of 

 Materials, size and form proper for magnetic needles . 

 Matter is never annihilated ...... 



MAUROLYCUS, his description of the structure and functions 

 of the eye . ....... 



MAYER'S dipping-needle, described .... 



Measures of heat, unknown to the ancients . . 



imperfections common to all instruments con- 

 structed for that purpose ..... 



M-casuring of distances, telescope for .... 



Mechanical properties of atmospheric air ... 



. . powers, description of .... 



properties of fluids, described ... . 



of elastic fluids . . 



[magnetism .... 



lectricity on bodies 

 it of electricity .... 



Ferent in Voltaic from those of com- 



ELECT. MAGN. 



r introduction to .... 



Nfcn, and the effect distinguished from 



_ 



other metals by galvanism 

 s, described .... 

 lents of its combustion . . 

 tations under galvanic influence 

 ofRoemur .... 



thermometers compared at different 



NEW. OPT. 

 OPT. INST. 



NEW. OPT. 



POP. INT. 

 MAGN. 

 POP. INT. 

 ELECT. 

 MAGN. 

 POP. INT. 



NEW OPT. 

 MAGN. 



TUEKM. 



OPT. INST. 

 POP. INT. 



MAGN. 

 ELECT. 



GAI.V. 

 POP. INT, 



GALV. 

 OPT. INST. 

 GALV. 



THERM. 



16 



8287 

 25 

 87 



47 



710 



11 



3 



10, 11 

 13 



14 

 15 



1922 

 53 



5587 

 24 



5358 



2325 

 2 



. 2 



914 



1418 



52 



37 



95 



. 34 

 3 



[35 

 40 



11,45 

 . 55 



. 81 



5560 



36 



6062 



5658 



2,3 



. 3 



79,80 



5156 



25 



. 7 



2029 



5660 



6569 



32, 33 



4245 



5557 



. 13 

 1-29 



73 



1114 

 4 

 13 



. 31 

 7 



