INDEX. 



R. 



Ramond's journey to the fummit of Mont 

 Peidu, 250 



Refraftion, horizontal, obfervations on 

 the quantity of, 46 — Is not the fame as 

 refleftion, 48 — Attributed tovaiiations 

 in the temperature, 49-1-Table of ob- 

 fervations, 51 



Regnler's padlock of fecurity, 43 — Re- 

 marks and annotations on, 45 



Refin from ambergris, properties of, 186 



Reverie, a ftate favourable to the pro- 

 duftion of fpedlres, 229 — Inftances, 



Richter, 135 



Ritter's experiments on galvanic pheno- 

 mena, 221 

 Roi, Col. 270 

 Rothe, 73 

 Rutter, 100 



S. 



Sabres made of native iron, 190 



Schaub, 134 



Scheeie difcovered arfeniated hidrogen gas, 

 200 



Sciences, antiquity of, in South America, 

 246 



Screw, meafuring, 247 



Seguin on the febrifuge principle of cin- 

 chona, 136 — Abftraifl of his enquiries 

 concerning fermentation, 221 



Sextant, its ufe in aeroftatic obfervations 

 Jiabie to error, 196 — Additional appa- 

 ratus to remedy the defeiS, 197 — Suc- 

 cefsful refuits, 198 



Shadows, coloured, memoir on, 282-— 

 Phenomena of, ib.— Obfervations on 

 their nature as produced by various 

 caufes, 283— General lefult, 2S5 



Smithfon's, Mr. analyfis of fome cala- 

 mines, 74 

 Vol, VL 



Soda, carbDnate of, found efflorcfcent on 

 walls, III— Method of obtaining pure, 

 193 



South America, curious particulars re- 

 fpeding, 242 



Spaniard, faid to be infenfiblc to the ac- 

 tion of heat or powerful acids, 139 



Specific gravity of gold fingulariy affcdled 

 by alloy, 157 — Various circumltances 

 which afFeft, 15S — Caufes of the va- 

 riation enumerated, 159 — ^Table of, 

 160 



Spedlres, memoir on thcfe produced by 

 difeafe, j6i — Attempt to explain them 

 by natural caufes, 229 



Speculum of a refledling telefcope is af- 

 fefted by change, of temperature, iG 



Spinoza, 172 



Square, reticulatsd, method of conflruc- 

 ting, 247 



Stars, caufes which afl'cdl their apparent 

 magnitude, 14, 15 



Steam, its force the fame from all liquids 

 under the fame conditions, 258, 267, 

 271 — Is capable of becoming liquid, 259 

 i — Its mechanical adlion tliftercnt from 

 that of gafes, ib. — Method of meafuiing 

 the force of, 260 — Examination of the 

 progreflion of its force, 262 — Table cf 

 its force at every degree of temperature, 

 264 — General law of its cxpanfion in 

 air, 271 — Has no chemical affinity with 

 gafes, 273 



engine, method of equalizing the 



motion of, 218 



■ ■ — valve, felf ailing and regulating , 



249 



Steinacher, on pharmaceutical preparations, 

 130 



Stones, meteoric, 135— Their exiftcnce 

 fully eftablifhed, 187— Hiftory of chicc 

 new fpecimen'i, 188 



St. Amand, tii 



St. John's wort, chemical examination of, 

 286 



c So'phur 



