INDEX. 



498 



Paulet(F.), demonstration of the equa- 

 lity of the sum of the angles of a tri- 

 angle to two right angles, 404. 



Peacock (Rev. G.), his report on Mr. 

 Lubbock's paper on physical astro- 

 nomy, 121. 



Pendulum, on its correction for the 

 reduction to a vacuum, 126 ; com- 

 parison of old and new corrections, 

 127 ; swung in a vacuum apparatus, 

 127 ; anomalies observed in experi- 

 ments with, 1 28 ; knife-edge suspen- 

 sion, 128, 352. 



, seconds', on the length of, 66, 



128,351,352. 



Pentacrinus Europaeus, produced from 

 the ova of the Comatula, 339. 



Perkins (J.) on the production of 

 steam, 123. 



Pettigrew (T. J.) on a remarkable 

 case of corpulency, 176. 



Pharynx and mouth, anatomical de- 

 scription of the, 103. 



Philip (Dr. A. P. W.) on the powers 

 on which the circulation of the 

 blood depends, 64. 



on the nervous and muscular 



systems, 164. 



on the nature of sleep, 179. 



on the nature of death, 264. 



on the powers of life, 401. 



Phillips (B.) on the secretion and uses 

 of the bile, 160. 



Phosphates, researches on the, 200, 

 209 ; on the constitution of the, 

 454. 



Phosphoric acid, on the modifications 

 of, 200, 209. 



Physical astronomy, 16, 51, 59, 75, 

 98, 101, 108, 121, 128, 137, 209. 



Physiology, of the minute and capillary 

 vessels, 45 ; of the thymus gland, 

 133 ; of the nerves of sensation, 205 ; 

 of the liver, 211 ; vegetable, 222 ; 

 of the brain, 283, 331 ; of respira- 

 tion in insects, 403 ; of the human 

 voice, 404. 



Placenta, human, on the, 75. 



Plana (Prof.), the Copley medal 

 awarded to, 305. 



Planetary inequalities, on, 16, 59, 77, 

 108, 209, 301. 



theory, 16, 77, 108, 211. 



Planets, on the figure of the, 22, 286 ; 

 on the theory of the perturbations of, 

 98, 102. 



Plants, on the action of light on, 364 ; 



their influence on the atmosphere, 

 364. 



Platypus Anatinus, internal structure 

 of, 93. 



Pneumatometer, Dr. Hall's, 105. 

 Poison, method of detecting minute 



quantities of, 5. 



, the Ipoh or Upas, 483. 



Poisson (M.), the Copley medal award- 

 ed to, 157. 



, theory of capillary action, 157. 



Polypi, cellular and tubular, 268 ; on 



the higher forms of, 479. 

 Pond (J.) on the new zenith telescope 



of the Royal Observatory, 270, 326. 



, notice of, 434. 



Powell (Rev. B.) on the repulsive 



power of heat, 294. 

 on the theory of the dispersion 



of light, 326,362, 459. 

 Predaval (Le Comte de), theorie ba- 



listique, 296. 

 Presents received by the Royal Society, 



1, 5, 12, 15, 17, 19, 20, 23, 25, 26, 



27, 29, 32, 36, 39, 41, 43, 45, 47, 



49, 51, 53, 59, 62. 

 Propelling ships, new mode of, 48. 

 Putrefactive fermentation, on, 407. 

 Pyrenees, mineral springs of, 383. 

 Pyrometer, register, new, 69. 



Quantities, on negative and imaginary, 

 4. 



Railways, on the theory of, 385 ; on 

 gradients on, 390. 



Reade (Sir T.), register of the baro- 

 meter and thermometer at Tunis, 

 388. 



Reade (Rev, J. B.) on the solar rays 



that occasion heat, 457. 

 Refractions, astronomical, on, 301. 

 , double, 322. 



Register, graphical, of tides and winds, 

 33. 



— — pyrometer, new, 69. 



Rennell (Major), notice of thelife and 



works of, 7. 

 Rennie (G.) on the friction of fluids, 



63. 



Reptiles, batrachian, killed by immer- 

 sion in hot water, 47. 



Repulsive power of heat, 294. 



Resistance of fluids, on, 199. 



Respiration, theory of, 334. 



,nearly suspended in hybernation, 



106. 



