INDEX. 



169 



R, observations on the defective pronunciation of the letter, 



iii. iro 

 Radiation of heat in the atmosphere, xviii. 305 

 Raffles' (Sir T. S.) account of the Sunda Islands and Japan, 



ii. 190 

 Rakinesqub (C, S.), description of the silures or cat-fishes of the 



Ohio, ix. 48 

 Rail-road, premium^for essay on, vi. 138 

 Rain, temperature of, in Paris, ii. 448 



extraordinary fall of, v. 136. Account of rain of earthy 



matter at Naples, 370 



(coloured), notice of showers of, vii. 189. ix. 201 



fall of, in the tropics, xv. 167 



quantity of, which falls at different heights, xix. 173 



Rainbow, theory of the, vii. 168 



observations on, x. 19 



Ramond (M.), result of his botanical researches in the Pyrenees, 

 ii. 51 



Ramsam (forest of), account of a salt lake and mud hillocks in, 

 i.257 



Ramsden's dividing engine, report on the present state of, xii. 3S1 



Rana^ on the urinary organs and urine of two species, xii. 130 



Rattle-snake skeletons, discovery of, xiii. 438 



Ray, botanical discoveries of, x. 54 



Rays composing the solar spectrum, account of, v. 77 



Reaping of corn before it is perfectly ripe, benefit of, x. 447 



Red cabbage, colour of, to preserve, xviii. 402 



Redoute (J. P.), systematic view of the plants contained in his 

 LiliaccSi i. 169 



notice of his work on Roses j iii. 417 



Red snow of the Alps, analysis of, ix. 199 



. early appearance of, x. 199. Experiments on, 395 



Red-ware, new glaze for, xv. 142 



Reflecting telescopes, mode of protecting the specula of, xv. 52 



— inferiority of, when compared with refrac- 

 tors, XX. 288 



