INDEX. 



Mucilaginous vegetable powders fropofcd is 



fubftitutes for gum Arabic, 232 

 Muriate of cerium, 298 

 ^~-m. I triple, of platina, 67 



N. 



Neumati) 154 



Newman, Mr. 129 



Newton, Sir I. 31, 53, 88, 128, 131, 139 



Nitrate of cerium, 297 



Nomcnclatuie of vegetables, defeftlve, 62 



Oil, probably reflefts frigorlfic rays, 190 



— — Frothing of by eleftricity, 221 



•"——of pepper, 71 



Olbcrs, Dr. 143 



Optics, phyfical, experiments and obfer- 



vations relative to, 63, 130 

 Ovals, fimple and cheap inftrument for 



delineating, 113 

 Oxalate of cerium, 299 

 Oxide of cerium, chemical examination 



of, 293 

 Oxigen, on the neceffity of atmofpherical 



to the procefs of vegetation, 217 



P. 



Paint facilitates the pafTage of heat, 61 

 Pallas, prize queftion refpedling the planet, 



141 

 Palfy, cure of by galvanifm, 246 

 Pappus, 162 

 Parallel rule, defcription and drawing of a 



new, 213 

 parkinfon's organic remains, 143 

 Parmentier, on the commerce of Jien's eggs 



and on their prefervation, 264 

 Parrot, Prof, defcription of his filtering 



machine, 40 

 Pelletier, 267 , 

 Pendulum, defolptlon of a tubular one, 



fuperior to the gridiron, 225 

 Pepper, chemical examination of, 68 

 Perpetual motion, new projed for a, 212 



Perfpe^live, inftrument for drawing from 

 nature, in, 121 



Philips, Mr. R. 18 



Phofphate of cerium, 298 



Phofphorated copper, 267 



Phofphorus, on the coft of making, 94. 

 — Readieft method of uniting it with 

 copper, 267 



Plana, 257 



Piazzi, 142, 274 



Piftct, 194, 207 



Piles, galvanic, power of different ones In- 

 burning wire, 241 



Planet, a new one, 301 



Platina, ignition and fufion of in hidrogen 

 gas, 24. — Method of preparing malle- 

 able, 68.' — Triple muriates of, 67.—' 

 Method of coating copper with, 303 



Play fair, Mr. 104 



Pollen of flowers, examination of the, 183. 

 —Is not neceflary to the production of 

 bees' wax, 184.-11. the food of the lar- 

 vae of the bees, 188 



Port-folios, cheap and fimplc contrivance 

 for making large, 128 



Prevofl, ProfeflTor, on an aflertion of La-- 

 voifjer, 247 



Prieftley, Dr. 4, 55, no, 180, 217, 270 



Principles, elementary of bodies, on the 

 contaft of, 247 



vegetable, complicated nature 



of, 69 



Prior, Mr. account of his new ftriking 

 part for a clock, 92 



Prize, aftronomical, 301 



Prony, 142.— On a condenfer of forces, 



275 



Prouft on the preparation of brandy from 

 the carobe tree, 302 



Prufllate of potaih, beft method of obtain- 

 ing it free from iron, 280 



Pruffic acid. Its unalterability by heat, 278 



Pyrotechnic obfervations, applied to the 

 conftruftion of evaporating furnaces, 204 



Q. 



Quellions, prize, 141 



