Index. 



Prouft, too, 154, 236 



Prufliates, their action on the acid folu- 



tions of barites, 196 

 Pruffic acid, Guyton on the affinities of, 



193 



R. 



Read, his pneumatic apparatus, 55 



Regnier, 217, 218, 277,1278 



Rennel, 33 



Richardfon, Dr. 17* 



Richter, 184 



Robifon, 31, 32 



Roy, Col. 131, 131, 213 



Rumford, Count, 198, 199 



Rutherford, Dr. 6 



S. 



Saunderfon, 189, 192 



Sauffure, 132, 213, 266 



Scheele, 240, 241 



Schober, 83 



Silver, formation of the hyperoxigenized^ 



muriate of, 242 

 Smeaton, 82 

 Smith, Dr. 39, 14$ 

 Soda, method of preparing the hyperoxi- 



genized muriate of, 185 

 Sounds, Mr. Gough's reply to Young's 



theory of compbund, 39 

 Sound, tranfmitted by means of a ft ring, 



57 

 Sowden, Captain, 58 

 Spallanzani, 1 12 

 Staneari, 212 

 Stone from Benares, analyfis of, 93, 94. 



—From Sienna, 95, 96. From York- 



fhire, 96.— From Bohemia, 96, 97 

 Sugars, new procefs for claying, by Cit. 



Lachenaie, 41 



T. 

 Tantalum, Ekeberg on the newly djfco- 

 • vered metal, 251 



Thermometer, depreflion of, in vacuo, 161 

 Trcmery on ele&ric fluids, 223, 234 



Trevithick, $$ 



Trommsdorff on a new gas, 30I 



V. 



Vandicr, 1-82 



V»uq.uclin, 135, 233, 255 

 Venturi, 27 

 Volta, 6, 72 



Volcanoes lunar, on the probability of 

 their eruptions reaching the earth. Fy 

 a correfpondent, 255. — Obfervations by 

 W.N. 25f 



W. 

 Walker, Mr. Ezektel, on the vibrations 

 . of pendulums in vacuo, 35.-— On a me- 

 thod of iricreafing the light of candles', 

 272, 273, 274 

 Water, law of its velocity, iffuing from 



refervoirs, 26 

 Water wheel, description of a, by Mr> 



Befant, 49 

 Watts, 1, 32, 268 



Wedgwood, 169;— On a method of paint- 

 ing on glafs, 167 

 Wilfon, Rev. J. on a method of increaf- 



ing the fenfibility of the barometer, 21 

 Wilfon, Mr. W. on the galvanic effecls 

 of particles of zin« and Copper in water, 

 147 

 Wollaftori, Dr. 7, 70, 123 

 Woltmann, 83, 87 



Woulfc's apparatus, Murray's improve- 

 ment of, 225 



Y. 



Yellows, are formed by the oxides of lead 

 and antimony, 149 



Young, Dr. on the moft ufeful parts of 

 hydraulics, from Eytelwe'm, 25, f<).r- 

 His reply to Mr. Gough, 145,— His 

 apparatus for exhibiting the colours' "of 

 thin plates, 283 



Yttria, Ekeberg bn the properties of the- 

 earth, 251 



Z. 



Ziegjer, 208 



END OF THE THIRD VOLUME. 



Printed by W. Strajtford, grown-Court, Temple-Bar. 



