INDEX. 



Porcelain earth, analyfis of, 277 , 



Portici, ancient manufcripts difcovered 

 at, ,303 



Poucrette manufactories, 125 



f oullaouen iron works, 48 



Poufehkin, Cou.nt, on the folution of 

 chromate of lead and filver, 144 



PowjI, David, his account of the emigra- 

 tion of the Welch, under their prince 

 Madoc, 18S 



Power, mechanic, on, 7.— Indentified 

 with animal exertion, 8.— pRife, ap- 

 plication, and definition of the term, 

 ib. 



Prieur, memoir by, on colours, 112 



Prince's improvement in the air-pump, 

 306 



Projectiles, method of meafuring the 

 initial velocity of, 41 



Prony, M. 10 — His method of meafur- 

 ing the initial velocity of projectiles 

 difcharged from fire-arms, 41 



Provincial focieties for fcientific and 

 literary improvements, ftate of, 267 



Prouft ProfefTor, on the meteoric ilone 

 of Sigena, 2 



Pruffian blue manufactories not pre- 

 judicial to the health, 128 

 Putrefaction, animal, pernicious in pro- 

 portion to its humidity, 125.— Pre- 

 vented, 144 

 PuazoIana f factitious, 331 



Radiation of heat, 74 



Rail roads, 266 



Reaping, on, 153 



Refpiration, chemical refearchcs concern- 

 ing, and fliort hiftoryof, 249.— New ex- 

 periments on, 250 



Refleftion of heat by policed and blacken- 

 ed bodies, 66 



Reverberatory furnace for experiments on 

 caft and malleable iron defcribed, 34 



Rkhman, ProfefTor, 297 



Richter, Dr. J. B. on pure nickel, 75— 

 On a metal much refembling nickel, 

 261 



Rilter, Mr. on galvanifm, 99.-— Biogra- • 

 phical notice of, 101, 10a 



Roads on an inclined plane, project for, 

 266 



Pvobertfoa, Dr. 188.— His balloon, 298 



Robins, Mr. Benj. 41 



Robinfon ProfefTor, 7. — Correction of a 

 mi (take in 12. — Diftinction between 

 gravity, weight, and heaviness, 14 



Rocks, Mr. JefTop's improved mode of 

 blaftmg, 60 



Roebuck, Mr. on water-blowing ma- 

 chines, 55 



Rome de rifle, 374 



Rofe, Mr* on the difcovery of a new 

 vegetable fubftance, 97 



Rumfbrd, Count, remarks on his ex- 

 periments on the denfity of water, 28. 

 — On the velocity of projectiles, 41. 

 — On heat, 65, 154.— On coloured 

 fhadows, 114. — His opinion on the 

 non-conducting power of fluids con- 

 troverted, 133.— On the expanfion of 

 water by beat, 343, 351 . 



Ruffian marine inftitution, 302.—Efla- 

 blifhments for Education, 302.— Geo- 

 graphical dictionary, 303 



Ruft in corn, 149. — Prevented by fteep- 

 ing* ib. 



Rye Harbour, account of tfoe means ufed 

 to make it navigable for mips of 

 confiderable burthen, 245 



S. 



Sal-ammoniac manufactories not In- 

 jurious to health, 128 



Salt of the fea, origin of, 59 



fpirit of, manufacture of, not in- 

 jurious to the health of the neighbour- 

 hood, 127 



Salts, deliquefcence and efflerefcence of, 

 240. — Experiments, 241.— Remark- 

 able facts, 244 



4 Salts 



