438 



Pepys (W. H.) on a new eudiometer, 

 i. 270 ; on respiration, i. 345 ; ac- 

 count of an apparatus for performing 

 electro-magnetic experiments, i i. 1 92; 

 on the respiration of birds, ii. 375. 



Perchloride of carbon, ii. 138. 



Percussion : on the developement of 

 magnetical properties in steel and 

 iron by, ii. 168, 210; on the force 

 of, i. 213. 



Percussion shell, Lieut.-Col. Miller's, 

 description of, ii. 296. 



Periscopic camera obscura and micro- 

 scope, i. 438. 



Perkins (J.) on the compressibility of 

 water, ii. 134, 289. 



Perspective, propositions on the elliptic 

 representations of circles, upon a 

 plane surface, by, i. 502. 



Philip (A. P. W.) on the principle on 

 which the action of the heartdepends, 

 and the relation which subsists be- 

 tween that organ and the nervous 

 system, ii. 8, 29 ; on the effects of 

 galvanism in restoring the due action 

 of the lungs, ii. 55 ; influence of the 

 voltaic battery in obviating the effects 

 of the division of the eighth pair of 

 nerves, ii. 156; on the effects of di- 

 viding the nerves of the lungs, and 

 subjecting the latter to the influence 

 of voltaic electricity, ii. 320; on the 

 functions of digestion, ii. 364 ; on 

 the functions of the nervous system, 

 ii. 373. 



Phillips (R.) on a new compound of 

 chlorine and carbon, ii. 153. 



Phosphorus: on the nature of, i. 321 ; 

 experiments on, i. 318, 378 ; on the 

 combinations of, ii. 95. 



Phosphorus and sulphur, on some com- 

 binations of, i. 440. 



Phosphuret of chromium, ii. 314. 



Photometer, new, ii. 231. 



Physical astronomy : improved solu- 

 tion of a problem in, i. 7 ; on the 

 integration of differential expres- 

 sions, i. 150; researches in, ii. 409. 



observations, on the probabi- 



lities of error in, ii. 106. 



optics, experiments and cal- 

 culations relative to, i. 131. 



Piezometer, ii. 134, 290. 



Pigott (E.), investigation ofthe changes 

 of the variable star in Sobieski's 

 Shield, i. 180. 



Pitch-stone of Newry, on the, ii. 1 72. 



Placenta : Sir E. Home on the, ii. 

 176; on the existence of nerves in 

 the, ii. 226. 



Planaria, on the genus, ii. 177, 238. 



Planet, methods of calculating the ex- 

 centric from the mean anomaly of a, 

 ii. 37. 



Planets, figure ofthe, i. 341. 



Plants: on the action of detached 

 leaves of, ii. 47 ; on the motions of 

 the tendrils of, i. 434. 



Plates, transparent, on the action of 

 their second surfaces upon light, ii. 

 395. 



Platina and mercury : palladium a 

 combination of, i. 123, 175; action 

 of upon each other, i. 175. 



Platina: new metalsfound with, i. 161, 

 162, 207; from Brazil, i. 330; me- 

 thod of rendering it malleable, ii. 

 352 ; its tenacity and specific gravity, 

 i. 455. ii. 352. 



Platinum : new fulminating, ii. 63 ; 

 on combinations of, ii. 124; sulphate 

 of, a delicate test for jelly, ii. 124 ; 

 finely divided, action of on gaseous 

 mixtures, ii. 216. 



Playfair (J.), account of a lithological 

 survey of Schehallien, i. 409. 



Plesiosaurus, fossil, in the sandstone of 

 Tilgate Forest, ii. 236. 



Pleura, on air found in the, ii. 202, 215. 



Pneumato-thorax, on air found in the 

 pleura in a case of, 202, 215. 



Point de Galle, latitude and longitude 

 of, ii. 177. 



Poisonous fangs of serpents, on the 

 structure of, ii. 101. 



Poisons : vegetable, the modes in 

 which death is produced by, i. 397 ; 

 on the action of on the animal sy- 

 stem, i. 427 ; of the rattlesnake, ef- 

 fects produced by, i. 354; of the 

 common toad, ii. 262. 



Polarization and double refraction in 

 crystallized bodies, on the laws of, 

 ii. 92, 104. 



, elliptic, on the phenomena 



and laws of, ii. 407. 



of light, on the, i. 453, 490, 



492, 504. ii. 4, 7, 14, 33, 39, 50, 92, 

 104, 122, 366, 387, 394, 395, 407. 

 Pond (J.) on the declinations of some 

 of the principal fixed stars, i. 245 ; 

 observation of the summer solstice 



