170 INDEX, 



Reflectors, earthenware, notice of, x. 170 



Refraction (double), on the communication of, to glass and other 

 hard and soft substances that refract singly by mechanical com- 

 pression and dilatation, i. 293. ii. 460 



— — refractive powers of muriatic acid, ix. 181 



(double), of minerals, x. 168. xi. 199. Observations 



on atmospherical, 353 



elements of a table of, deduced from observations only, 



xiv. 189 



empirical elementsof a table of, xv. 128. Remarks 



on Mr. Plana's researches relating to, 362 



comparison of the new tables of, with observations on 



astronomical refraction, xvii. 130 



Register thermometer, form of, iv. 43. A new principle sug- 

 gested for it, 44 



Regla (Count de), description of coal found on the estates of, 

 xix. 27 



Regnier (M.), ductilimetre of, described, xiv. 221 



Rein-deer successfully brought to England, xii. 427 



Rennel (Major), on the probable course and termination of the 

 river Niger, i. 265 



Rbnnib (George, Esq.), account of the mineral springs of Caldas 

 de Rainha, v. 60. Description and measurement of the aque- 

 duct at Alcantara, 281 



' remarks of, on the design for London Bridge, xvi. 28 



Repeating-circle, directions for using, v. 213 



* Republique de Lettres,' notice of, xiii. S7 



Repulsion and attraction without electricity, phenomena of, ii. 



427 

 exerted by heated bodies at sensible 



distances, xx. 164 

 Resin (Indian), experiments on a new species of, iii. 113 

 Resinous bodies, electrical conducting power of melted, xviii. 403 

 Resistance of air, as determined from Captain Kater's experi- 

 ments on the pendulum, xv. 351 

 Respiration, action of the muscles of, explained, iii. 304 



