300 Index. 



Galvanic circles, effects from, i. 125. 



Gasses, attraction of, for caloric, ii. 37, 38. i 



Gas, nitrous, ii. 47 hydrogen, 48 oxygen, how to be 

 procured, 38 nature of nitrogen, 46. 



Gelatine, chemical remarks on, ii. 287, 288. 



Gems, nature and distinctions of, ii. 1QO. 



Georgium Sidus, some particulars concerning this planet, 

 i. 307. See also VQO. 2Q5. 304, 305 account of its 

 satellites, 325 to 328. 



Glass, its advantages and disadvantages as a material for the 

 composition of chemical vessels, ii. 104 mode of cut- 

 ting with a red hot iron, 111. 



Glass house furnace, construction of the, ii. 122. 



Glasses, effects of optical, i. 3 .different shapes of opti- 

 cal glasses, and application of the principle of refraction 

 to the construction of them, i. 151 to l63 lecture 

 on optical glasses, 177 account of several j spectacles, 

 187 telescopes, IS() microscopes, ib. 



Glucina, account of this kind of earths, ii. 197. 



Gluten, chemical remarks on, ii. 281. 



Gold readily dissolved by condensed light, i. 136 proved 

 not to be a fixed metal, ii. 82, 83 its chemical pro- 

 perties, 245. 



Gravity, or gravitation,- phaenomena of, i. 2 nature of 

 the principle explained, 10. 14 its force varies at dif- 

 ferent v distances from the earth's surface, 216 *prin- 

 ciple on which falling bodies acquire fln accelerated 

 force, 218 account of the centre of gravity, 228. 



Gum, chemical remarks on, ii. 277. 



Gum resins, chemical remarks on, ii. 283. 



Gutta serena, an affection of the eye, i. 184. 



Gymnotus, the, or electrical eel, i. 127. 



Gypsums, account of, ii. 180 to 182. 



H. 



Hail, phenomenon of, i. 4 its formation explained, 95. 



Harmattan, the wind so called, i. 89. 



Harvest-moon, this pha?nomenon accounted for, i. 317 to 

 322. 



Heat, real principle of the distribution of, ii.65 fluidity, 

 one of the most general effects of, 66 difference be- 

 tween latent and' sensible, 69 animal and vegetable 

 substances, how acted on by, 82 -different means of 



