437 



between, ii. 75 ; of the tribes of 

 opossum and ornitborhynchus, ii. 

 114. 



Ovarium, a case of the human foetus 

 found in the, ii. 123 ; case of a full- 

 grown woman in whom the ovaria 

 were deficient, i. 1 94; on the passage 

 of the ovum from the ovarium to the 

 uterus, ii. 70. 



Oxalic acid, i. 285. 



Oxide of iron, new species of, i. 126; 

 magnetic attraction of, i. 204. 



Oxygen and iodine, experiments on a 

 solid compound of, ii. 19. 



Oxygen and oxymuriatic gas, on the 

 combinations of, i. 385, 393. 



Oxygen gas and atmospheric air, 

 changes produced in, by respiration, 

 i. 305. 



Oxyiodic acid, ii. 20. 



Oxyiodine, a new compound of iodine 

 and oxygen, ii. 19. 



Oxymuriatic acid, nature and combi- 

 nations of, i. 377, 385, 393. 



Oxymuriatic and muriatic acids, expe- 

 riments on, i. 431. 



Oyster, and fresh-water muscle, on the 

 mode of propagation of, ii. 301. 



P. 



Pacific Ocean, determination of its re- 

 lative height above the "Atlantic at 

 Panama, ii. 385. 



Painting, on the colours used by the 

 ancients for, ii. 11. 



Palladium: on the nature of, i. 121, 

 1 75 ; on the discovery of, i. 207 ; 

 from Brazil, i. 330 ; malleable, ii. 

 353. 



Pallas and Ceres, Dr. Herschel's ob- 

 servations on, i. 80. 



Panama, survey of the Isthmus of, ii. 

 385. 



Papyri found in the ruins of Hercula- 

 neum, experiments on, ii. 145. 



Parallax and aberration, investigation 

 of the effects of on the places of 

 certain fixed stars, ii. 151. 



Parallax of a Aquilse, on the, ii. 101. 



of a Lyra, ii. 93, 184, 222. 



of the annual orbit, i. 373. 



of the fixed stars, ii. 65, 66, 



79, 93, 102, 274, 308. 



Paris and Greenwich Observatories, 

 observations made for tin- purpose of 



determining the difference of meri- 

 dians of, ii. 261, 319, 335. 



Parry (Capt. W. E.), magnetical ob- 

 servations at Port Bowen, ii. 293 ; 

 observations for determining the dip 

 of the magnetic needle at Woolwich, 

 ii. 293 ; observations to determine 

 the amount of atmospherical refrac- 

 tion at Port Bowen, ii. 296. 



Parry (Dr. C. H.) on a case of nervous 

 affection cured by pressure of the ca- 

 rotids, i. 390. 



Pearls, on the production and formation 

 of, ii. 278. 



Pears (C.), history of a woman in whom 

 the ovaria were deficient, i. 1 94. 



Pearson ( Dr. G. ) on expectorated 

 matter, i. 339 ; experiments on pus, 

 383 ; on the colouring matter of the 

 black bronchial glands, and of the 

 black spots of the lungs, i. 464. 



Pearson (J.), account of the two mum- 

 mies of the Egyptian Ibis, i. 201. 



Pendulum, invariable : experiments 

 made with it in London, at the Gala- 

 pagos Islands, at Sans Bias, and at 

 Rio de Janeiro, ii. 193; at New 

 South Wales, ii. 1 96 ; at Greenwich, 

 at Port Bowen, and on the eastern 

 side of Prince Regent's Inlet, ii. 290; 

 on the difference in the number of 

 vibrations at London and Greenwich, 

 ii. 360; on the reduction to a vacuum 

 of the vibrations of, ii. 368 ; obser- 

 vations with for determining thecom- 

 pression of the earth, ii. 396; on the 

 difference in the number of vibrations 

 at Greenwich and Altona, ii. 403. 



, seconds : experiments for 



determining the length of in the la- 

 titude of London, ii. 83, 255 ; on die 

 variation in the length of at the prin- 

 cipal stations of the Trigonometrical 

 Survey of Great Britain, ii. 1 1 7 ; on 

 the acceleration of in different lati- 

 tudes, ii. 144; observations for as- 

 certaining the length of at Madras, 

 ii. 165; comparison of the length of 

 at Unst and at Leith Fort, ii. 255 ; 

 on the difference in the length of in 

 London and Paris, ii. 329. 



Kater's convertible, on the 



reduction to a vacuum of, ii. 381 

 investigations relative to the, ii. 401 . 

 -, rolling, remarks on Killer's 



formula for the, ii. 108. 



