Photography, new processes hi, 393,
397, 398.
, photographic properties of mercury, 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.
