E X. 



ACCUM, Mr. on the combinations of 

 fulphur and phofphorus, i— Analyfis 

 of the Egyptian heliotropium, 65 — > 

 Defcription of an apparatus for drying 

 chemical produfts and for congelation> 

 212 — Letter refpeftingAuguftine earth, 

 214 — Defcription of an improved por- 

 table univerfal furnace, 273 



Acetite of lead, remarks on, 223— Two 

 fpecies of, ib. 



Acid> benzoic, found in ambergris, 182 

 , gallic^ cannot be obtained pure from 

 bark, 34 



i , nitrous, decompofition of, by phof- 



phuret of fulphur, 5 



Ml , phofpboiic, la cryftallizabJe by long 

 keeping, 131 



« ■, pruffic, new procefs for obtaining 

 it pure, 134 



■ , fulphuretted-muriatic, p"^odu£lion 

 of, 104— Properties of it, ib. — Che- 

 mical examination of, 105— Comppfi- 

 tion of, 107 — Remarks on, 108 



« I , fulphuric, componsnt parts of, 53 

 —Seems to be produced whenever ful- 

 phur is acidified or fubiimed, 97, 98 



, fulphurous, properties of, 93 — 

 Contains fulphuric acid, 94 — Analyfis 

 of, 95 — Is probably a compound of ful- 

 phuric acid and fulphur, 97 

 Vol. VI. 



Adams, 235 



Adipocire obtained from ambergris, 186 



Aeroftatic machines, advantages to he 

 derived from the ufe of, 194 — Experi- 

 ments with^ 195— Apparatus for making 

 terreftrial obfervations from, 196 — Con- 

 ditions neceflary to obtain corredt r.e- 

 fults, 199 — Valuable properties of, ib, 



Auguftine earth, queries refpefting, 139 

 — Method of extrafting, 214 — Cha- 

 rafters of, 215 



Alkin, 130 



Air is decompofed by phofphuret of ful- 

 phur, 4 — Its moifture does not impede 

 telefcopic vifion, 10 — ^Dry, is unfa- 

 vourable to ftellar obfervations, 13 



— -pump, letter from Dr. Prince re- 

 fpefting his, 235 — Improvements in, 

 236 — Is the fimplefl form now ufed, 

 238 



Alloys, experiments on the comparative 

 wear of feveral, 145 — Compound, arc 

 real chemical combinations, 160 



Ambergris, a produft of impaired digef- 

 tion, 179 — Natural hiftory of, ib.— Ex- 

 ternal qualities of, i8o-*-Formerly claf- 

 fed among bitumens, ib. — Geoft'roy's 

 analyfis of, ib. — Many varieties in 

 commerce, 181 — Fabrication by art, 

 ib,— New refearchps into the nature of, 

 ib. — Phyfical properties of, ib. — Che- 

 mical properties of, l8a— Alcohol i; 

 b the 



