490 



INDEX. 



Photography, new processes hi, 393, 

 397, 398.* 



, photographic properties of mer- 

 cury, 398. 



Photometer, self-registering, 209. 



Physical geology, 83, 115, 129, 367. 



Physics, a new theory of, 325. 



Physiology of vision, 76. 



of cells, 222, 279. 



■ of the decidua, 370. 



- of certain structures in the orbit, 

 311. 



of the iris, 439. 



Piccolomini (Comte), geographical po- 

 sition of the triangulations of the 

 Californias and of the Mexican 

 coasts of the Pacific, with heights 

 of that part of the Cordilleras, 196. 



Pigmentum nigrum, compared with 

 corpuscles of the blood, 324. 



Pigotite, on the constitution of, 239. 



Pillars of cast-iron and other materials, 

 on the strength of, 227. 



Pinus abies, resin of, 163. 



Planets, new method of computing the 

 pertm-bations of, 435. 



Plants, the influence of nitrogen on 

 the growth of, 66, 148. 



■ , on the evolution of nitrogen du- 

 ring the growth of, 70. 



— , on the formation of alkaline and 



earthy bodies in, 131. 



from Kerguelen's land, 305. 



on the ascent of the sap, and 

 new method of preparing, for phy- 

 siological investigations, 432. 

 ■ , on the descending fluids of, 449. 



, on the respiration of the leaves 



of, 466. 



— — , carbon and nitrogen made by, 



during their growth, 472. 

 Platina, on the reduction of, 447. 

 Platinum, on the compounds of, 380. 

 Plesiosaurus, remains of, found in 



Tilgate Forrest, 290. 

 Plymouth, on the laws of low water, 



and on the permanency of mean 



water at, 152. 



— , tide observations at, 242. 

 , hourly meteorological observa- 

 tions made at, 303. 

 Poiseuille's hsernadynamometer, 285. 

 Poisons, on the mode of operation of, 

 155. 



Poisson (S. D.), biographical notice of, 

 269. 



Polarimeter, an instrument for mea- 



suring the degrees of polarization, 

 307. 



Polarization and double refraction of 

 heat. Prof. Forbes's investigations of 

 the, 104. 



, elliptic, of light, 394,436. 



, on the theory of the dispersion 



of light as connected with, 61, 210. 



Polarized light, phenomena of thin 

 plates of solid and fluid substances 

 when exposed to, 302. 



Pollock (SirF.), method of proving the 

 three leading properties of the ellipse 

 and the hyperbola from a well known 

 property of the circle, 443. 



Port Arthur, Van Diemen's Land, 

 meteorological register kept at, 200, 

 232, 329. 



, register of tides at, 232, 



Potassium, electro-chemical equiva- 

 lents of, 232. 



, on the ferrosesquicyanuret of, 



239. 



, iodide of, its applicability to the 



cure of chronic diseases, 473. 



Powell (Rev. B.) researches towards 

 establishing a theory of the disper- 

 sion of light, 47. 



on the theory of the dispersion of 



light as connected with polarization, 

 64, 210. 



on the theory of dark bands 



formed in the solar spectrum by 

 transparent plates, 211. 



on the elliptic polarization of 



light, 394. 



— — on certain cases of elliptic pola- 

 rization of light by reflection, 436. 



Prague, magnetic-term observations 

 m.ade at, 280, 294, 329, 373, 380, 

 396, 439, 467. 



Precession and nutation, phenomena 

 of, assuming the interior of the earth 

 to be fluid and heterogeneous, 115, 

 129, 367. 



Pre vest (P.), biographical notice of, 

 180. 



Prince of Wales's Island, tidal obser- 

 vations at, 311. 



Princep (J.), biographical notice of, 

 259. 



Principia, Newton's, the manuscript 

 of, in the possession of the Royal 

 Society, 253, 335. 



Prismatic colour, new, 208. 



spectrum, extension of the visi- 

 ble, 207. 



