INDEX. 



491 



Prismatic spectrum, mathematical in- 

 vestigation of the phenomena of 

 dark bands crossing the, 211. 



Prony (M. de), biographical notice of 

 the late, 178. 



Prussia (King of), His Majesty's visit 

 to the Royal Society, 370. 



Pterodactylus, remains of, discovered 

 in Tilgate Forrest, 290. 



Pulley, modulus of the, 320. 



Pus-globules, derived from corpuscles 

 of the blood, 324. 



Quetelet (Prof.) on the variation of the 

 magnetic declination and horizontal 

 intensity at Brussels, 329. 



Rabbit, ova found in the Fallopian 

 tube and uterus of the, 222. 



Rain, average annual depth of, in 

 London, 300. 



, depth of, in 1839, 203. 



Rain-guage,a few remarkson the, 297. 



, the Royal Society's, on the po- 

 sition of, 3. 



Rainey (G.) on the cause of the ascent 

 and continued motion of the sap, 

 432. 



on the descending fluids of 



plants, 449. 



Rays of the solar spectrum, the che- 

 mical action of the, on preparations 

 of silver, &c., 205 ; combined che- 

 mical action of rays of different de- 

 grees of refrangibility, 208 ; the 

 whitening power of several under 

 the influence of hydriodic salts, 208; 

 analysis of the chemical by absor- 

 bent media, 209. 



Reade (Rev. J. B.) on a new theory of 

 earthy bases of vegetable tissues, 52. 



on the construction and use of 



single achromatic eye-pieces, 195. 



Receipts and Expenditure of the Royal 

 Society, in 1836-37, 29; in 1837- 

 38, 106 ; in 1838-39, 185 ; in 1839- 

 40, 272; in 1840-41, 355; in 

 1841-42, 423. 



Red rays, chemical action traced much 

 beyond the extreme, 208. 



Redhouse (J. W.), results of meteoro- 

 logical oljservations at Constantino- 

 ple, 293. 



Rees (Dr.G. 0,.) on the chemical ana- 

 lysis of the contents of the thoracic 

 duct, 373. 



Refractions, astronomical, on the 



theory of, 59, 60; Cassini's theory, 

 60; problem of, Newton's solutions, 

 59, 60 ; comparison of tables of, 63. 

 Refractive indices, comparison of ob- 

 served, with the results of theory, 

 47. 



Regar soil of India, on the, 53. 

 Resins, on the constitution of, 136, 



162, 218, 241. 

 Respiration, theory of, experiments on 



the blood in connexion with, 78. 

 of the leaves of plants, on the, 



466. 



Respiratory organs of animals and the 

 preservation of independent tempe- 

 ratures, the relation which exists 

 between, 474. 



system of nerves, on the, 218. 



Rete mucosum, 165. 



Retin-asphalt, resin of, 219. 



Rickman (Mr.), notice of the late, 

 261. 



Riddell (Lieut. E. J. B.), meteorologi- 

 cal observations made at Toronto, 

 295. 



Rigaud (Prof.), biographical notice of, 

 175. 



Rigg (R.) on the influence of nitrogen 

 on the growth of plants, 66, 148. 



on the evolution of nitrogen du- 

 ring the growth of plants, 70. 



on the formation of alkaline and 



earthy bodies with reference to their 

 presence in plants, 131. 



on the influence of nitrogen in 



promoting vegetable decomposition, 

 148. 



on the chemical constitution of 



bodies Avhich undergo the vinous 

 fermentation, 149, 165. 



on the formation of alkaliiie 



and earthy bodies by chemical ac- 

 tion, 165. 



, experiments showing that car- 

 bon and nitrogen are compoinid 

 bodies, 472. 



Ritchie (Wm., LL.D.), notice of the 

 late, 14. 



Robertson (J.), geological specimens 

 procured from Kerguelen's Land, 

 305. 



, description of plants from Ker- 



guelen's Land, 305. 



, catalogue of birds collected on 



board H.M.S. Tei'ror, between the 

 Cape of Good Hope and Van Die- 

 men's Land, 305. 



