[ 49^ 3 



diminution of air by the electric fpark, p. 3S2 — 384. No ph'ogiflon communicated 

 by the eleftric fpark, p. 384. 



Air eindWatcr^ Experiments and obfervstions relating to, by the rev. JoJeph Prieflley, 

 LL.D. p. 279. Opinions of Mr. Cavendilh, Mr. Watt, and M. Lavoifier, con- 

 cerning decompofed air, p. 2S0. The author's opinion of inflammable air, and 

 fixed air, both which had been firft advanced by Mr. Kirwan, ibid. Experiment to 

 afcertain whether any water is produced when the air is made to difappear, p. 281. 

 Other experiments of the fame kind, p. 28 i. A peculiar circumilance attending the 

 inelting of call iron with a burning lens, p. 283. Refult of mel-ing caft iron in the 

 bottom of a deep glafs receiver, p. 284. Mr. Watt's conclufion thereon, ibid. A 

 new and unexpected appearance which occurred in endeavouring to revive the calx of 

 iron, or a calx faturaced with pure air, ibid. Experiments to determine whether 

 fixed air or water would be the produce of combining inflammable and dephlogifti- 

 cated air, p. 2S5 — 287. Obfervation thereon, p. 287. Refults of other experi- 

 ments with the calx of copper, and precipirate, perfe, in infi:rmmab!e air, p. 288. 

 Refledion on the relation of water to inflammable air, and efpecially Mr. Cavendifh's 

 ideas on the fubied, ibid. The powerful attraction that charcoal or iron appear to 

 have for vvater, when thty are intenfely hot, p. 289. Experiment to afcertain the 

 influence of unperctived molfl:ure in the produdlion of infla<rimable air, ibid. M. 

 Lavoificr's method of obtaining inflammable air with an hot iron tube and an hot 

 copper tube, p. 290. Refult of experiments made with charcoal, p, 291 — 296. 

 And of others made with iron, p. 297. Obfervations thereon, p. 298. See Bal- 

 loons> Experiment to afcertain the quantity of inflammable air which may be 

 obtained from any given quantity of iron, p. 298. The fuppofition that vvater confifts 

 of two kinds of air endeavoured to be explained, p. 299. Procefs of that invefliga- 

 lion, p. 300. Theory -of that p.rocef?, p. 301. Analogy betvveen the experiment 

 of the calx of iron imbibing inflammable air, and the iron itfelf imbibing dephlo- 

 gifticated air, p. 302. Experiments to prove that phlogifton is a real fubftance capable 

 of afiuming the form of air by means of water and hear, p. 303. Call iron 

 annealed remarkably different from that which has not undeigone that operation, p. 

 304. Experiment wi(h precipitate per Je^ ibid. EiFefts of heating iron in all the 

 different kinds of air, p. 305. And of tranfmitting fleam through a copper tube, 

 to try the effeAs of fpiiit of wine, ibid. Charcoal of metals explained, p. 306. 

 General inferences from the principal experiments, ibid. 



Algd, ^^t Variable Star, Opinion of aftronomers very unfettled concerning the change 

 of its light, p. 134. 



Anderfon^ Mr, James. ^tQ MorneGarou. 



Animal Floiver. See Barbadoes, 



Animals, preferved in fplrits, not fo fit for anatomical examination, p. 340. 



ArchiteSlurt, (kc. Sketches and defcriptions of three fimple inftruments for drawing 



architeAure and machinery in perfpe6^ive, by Mr. James Peacock, p. 366. Direc- 



7 tions 



