298 Index. 



'Electric light, discovery of the, i. 99 substances, 97. 



Electrics, what, i. 102" 



Electrifying machine, the first, i. Q8. 



Electrometer, account of this instrument, i. 113. 



Equation tables, use of, ii. 9. 



Equator, the, what, i. 263. 



Equinoxes defined, i. 268 precession of the, explained, 

 275. 



Ether, curious result of an experiment to boil it in vacua, 

 ii. 79 chemical account of it, considered as a com- 

 pound combustible substance, 217. 



Eudiometer, construction of the instrument so called, ii. 

 47- 



Evaporation, constant process of, i. 93 process of, ex- 

 plained, ii. 81 description of vessels used for this pro- 

 cess in its varieties, ii. 108 to 111 how performed to 

 dryness, 131. 



Expansion, one of the effects of caloric j experiments and 

 illustrations on this subject, ii. 57 bodies expanded 

 by caloric, never increase in weight from its presence, 6 1 . 



Expansion and Fluidity, difference between, ii. 67. 



Experimental philosophy, origin and importance of, i. 7 

 to 9 lecture on, 21 6. 232. 



Eye, curious structure of the ; its method of action, and. 

 some of its affections explained, i. 179. 188. 



F. 



Fabrina, an animal matter, ii. 282. 288. 



Falling bodies, principle on which they acquire an acce- 

 lerated force, i. 217, 218. 



Fermentation, a method of producing heat for chemical 

 purposes, ii. 113 curious remarks on the nature of 

 this process, 284, 285. 



Fire damp in coal mines, ii. 50. 



Fire engine, principle of the, i. 58. 



Fixed oils, nature of, ii. 221, 222. 



Fixed stars, number and distance of the, i. 257 258 

 difference between the period of their diurnal revolution 

 and that of the sun, 277, 278. 



