[ 49 2 ] 
diminution of air by the eledtric fpark, p. 582 — 384. No phlogifton communicated 
by the eleftric fpark, p. 384. 
j 4 k and Water , Experiments and obfervations relating to, by the rev. Jofeph Prieftley, 
LL.D. p. 279. Opinions of Mr. Cavendifh, Mr. Watt, and M. Lavoifier, con- 
cerning decompofed air, p. 280. 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. 282. A peculiar circumftance attending the 
melting of call iron with a burning lens, p. 283. Refuk of melting caff iron in the 
bottom ot a deep glafs receiver, p. 284. Mr. Watt’s conclufron thereon, ibid. A 
new and unexpected appearance which occurred in endeavouring to revive the calx of 
iron, or a calx faturated with pure air, ibid. Experiments to determine whether 
fixed air or water would be the produce of combining inflammable and dephlogifti- 
cated air^p. 285 — -287. Obfervation thereon, p. 287. Refults of other experi- 
ments with the calx of copper, and precipitate, per fe, in inflammable air, p. 288. 
Refleftion on the relation of water to inflammable air, and efpecially Mr. Cavendifh’s 
ideas on the fubjeft, ibid. The powerful attraction that charcoal or iron appear to 
have for water, when they are intenfely hot, p. 289,.. Experiment to afcertain the 
influence of unperceived moiflure in the production of inflammable air, ibid. M. 
Lavoifier’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 water confifts. 
of two kinds of air endeavoured to be explained,, p. 299. Procefs of that invefliga- 
tion, p. 300. Theory of that procefs, p„ 3CH. Analogy between 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 affuming the form of air by means of water and heat, p. 303. Caft iron' 
annealed remarkably different from that which has not undergone that operation, p. 
304. Experiment with precipitate per fe, ibid. Effects of heating iron in all the 
different kinds of air, p. 305. And of tranfmitting fleam through a copper tube, 
to try the effects of fpirit of wine, ibid. Charcoal of metals explained, p. 306,* 
General inferences from the principal experiments, ibid. 
Algol, See Variable Star » Opinion of aftronomers very un fettled concerning the change 
of its light, p» 134. 
Anderfon , Mr, James. See Morne Gar on. 
Animal Flower. See Barbadoes. 
Animals , preferved in fpirits, not fo fit for anatomical examination, p. 340. 
Architecture, &c. Sketches and deferiptions of three fimple inftruments for drawing 
architecture and machinery in perfpe&ive, by Mr, James Peacock} p. 366. Pirec- 
* tions 
