INDEX. 



Gai-Luffac, 253 



Galvanic phenomena, additional experi- 

 ments on, 221 



Garden, 2 



Gafes, cannot be reduced to a ftate of 

 liquidity, 259 — Differ from fteam or 

 vapour in their mechanical aftion, lb. 

 —Have no chemical affinity with va- 

 pour, 273 



, arfeniated hidrogen, difcovered by 

 Scheele, 200 — Properties of, ib.'t— New 

 inveftigations, 2©i — Methods of ob- 

 taining, ib.— Phyfical properties of, 

 202 — Adlion with gafes, ib. — Theory 

 of its decompofition by oxigenated mu- 

 riatic acid gas, 204 — Tefts to difcover 

 its prefence, 205, 208 - Compofition 

 of, 206 — Habitudes to acids, ib. — Cu- 

 rious phenomenon, 207 — Habitudes to 

 metallic folutions, 208--.T0 various 

 other bodies, 209 



1 ' ■', mixed, experimental eflays on the 

 conftitution of, 257 — Do not repel each 

 other, 258 — Are all equally expanded 

 by heat, ib. 



" , fulphurous acid, abforption of by 

 water, 93 



Gelatine, propofed as a fubftitute for cin- 

 chona, 138— Comparifon of the medi- 

 cinal virtues of the two fubftances, ib. 

 —Is not the febrifuge principle, 225 

 —Comparifon with cinchonin, 229 



Geoffroy, 141, 180 



Gefner, 72 



Glauber, 216 



Goetling, 214 



Gold, experiments on the comparative 

 wear of various alloys of, 145 — Stamp- 

 ing increafes the lofs, 146 — Fine lofes 

 more than alloys, 147— -Conclufions, 

 ib.— Diftinftion between hard and brit- 

 tle, 149 — Further experiments, 150 — 

 General refults, 152— -Beft adapted for 

 5 



coin when alloyed, 153 — Comparifon 

 of three kinds of ftandard, 155 Spe- 

 cific gravity of, alloyed with different 

 metals, 157 



Grafting, extreme branch, propofed as a 

 remedy for decayed trees, 124 



Gram, 71 



Granet, 131 



Gregor, 113 



Greville, the Right Hon. Charles, on 

 meteoric ftones and native iron, 187 



Ground-nut of the Weft Indies, culti- 

 vated for its oil, 224 



Gruber, 47 



Gum - kino, an erroneous appellation, 

 232 



Gunpowder, antiquity of the invention of, 

 71 



Guyton's pyrometer of platina, 89— Ex- 

 amination of a native carbonate ofmaj- 

 r.efia, 240 



H. 



Hales, account of tv^o remarkabte ones 

 with parhelia, 54 — Theory of, 56 



Han way, 255 



HafTenfratz's firft memoir on coloured 

 fhadows, 282 



Hatchett's, Mr. experiments and obferva- 

 tions on gold and its differcut alloys, 



145 



Hauy, 74 



Hazinefi, effe^s produced by it on tele- 

 fcopic vifion, 15 



Heat, the focal length of mirrors altered 

 by, 16— Experimental proofs of this 

 effeft, 18 — Theories of, 26 — The 

 thcrmometiical degrees of, are to be 

 taken according to the capacity of the 

 body, 27 — Applied during a change of 

 capacity does not alter the temperature, 

 ib. — The experiments to afcertain the 

 natural zero erroneous, 28 — Method of 

 afccr- 



