INDEX. 



Fire, fpontaneous of a beautiful green, 

 296. — Under water, ib.— Other curious 

 combuftions, 297 



Fifh bones abound with phofphoric acid, 

 299 



Flints, gun, ait of making, 88 



Fluids, the amber or other floating bodies 

 in them, are not moved by currents, 

 82. — Experiments on their power of 

 tranfmitting heat, by Mr. John Mur- 

 ray, 241. — Semi-opake, ufed by Dr. 

 Herfchel, inftead of dark glafles, 224 



Fluoric acid contains lead ; how to purify 

 it, 299 



Focus, folar, curious fail refpedting it, 



3*9 



Fontana, 319 



Forks, mufical, cxquifitely tuned, 3:0' 



Fourcroy, 119.— His error in pointing 



out the air bladder of the carp as a 



fource of azote, 299 

 Franklin, Dr. 150 

 Frogs remarkably affected by the prefence 



or abfence of light, 301. — Converted 



into clear gelly by potafh, ib. — How 



affected by the gafes, 30a 



G. 



Garnet, red, 44 



Gamier, 168 



Gallic acid, purification of, 236 



Gallitzin, Prince, 44, — J51 



Gas, nitrous, its abforption by the falts of 

 iron, 107 



Gaufs, his elements of the new planet 

 Ceres, 195, — 318 



Germination, how affected by air, 157. — 

 How arretted by oxigen, 204 



Gough, Mr. J. on prime numbers and 

 irefolution of a number into all its fac- 

 tors, 1 



Graphometer of Carangeau, description 

 and plate, 132 



Gregory's aftronomy, 75 



Grutmacher, 34 



Galvanifm, Volta's theory of, 135.— Ufed 



to charge the Haarlem battery, 173, 

 •—■198.— Said to be the fame as magne- 

 tifm, 234 



Guillemard, 151 



Gun-flints, art of making, 88 



Guyton, 34, 119 



H. 



Haley, his cfcapemtnt, 251 



Haller, 34 



Hamilton, Dr. 62 



Hatchett, Charles, Efq. his difcovery of 

 the new metal columbium, 32, 33 



Haiiy, 132, 193 



Heat, its tranfmiflion downwards through 

 fluids included in a veffel of ice, &c. 

 by Mr. Murray, 165, 241 



Herfchel, Dr. on the nature of the fun, 

 13. — Ufes liquids inftead of dark glafles, 

 21,— 151.— His darkening apparatus by 

 fluids, 224 



Hidrogen, found from burning it, 129.— 

 Sulphurated acts as an acid, 303 



Hidrofulphuret of foda, 303 



Higgins, Dr. on the mufical found pro- 

 duced by the flame of hidrogen, 129 



Hoffman, F. 114 



Hoffmanfegg, Count, 151 



Hornblower, his hydraulic bellows, 219 



Houdart, 159 



Huber, on the influence of air in vegeta- 

 tion, 157 



Huddleftone, Efq. his excellent mono- 

 chord, 320. — Very exact method of 

 tuning, ib.— 'Strange influence of two 

 pipes of his organ on each other, ib. 



Humboldt, Cit, 109.-00 the earth eaten 

 by certain favage nations, 1 52 



Humidity in galvanifm faid to act only as 

 a conductor, 138 



Hutton, Dr. his theory of rain, 91 



Hydraulic apparatus of Mr. Clofe, 27. — ■ 

 The fame analyzed, 145 



Hydraulic bellows of Hornblower, 219 



Hydrophanes, 92 



I. 



