612 
INDEX. 
Pendulum, reduction to a vacuum, comparison of the old and new corrections for, &c. 
433. 
- difference in the two ends of a convertible one, 437. 
- factors for the correction of a convertible one, for the reduction to a vacuum, 
&c. 437. 
- suspended over a cylinder, 461. 
- -— anomalies of the knife edge suspension of, 463. 
- ( seconds ) at Greenwich, on Captain Sabine’s recent determination of the length 
of, 470. 
- method of observing and of reducing the observations of, 472. 
-detail of the experiments, 477. 
- correction for the arc of vibration of, 468. 
Pendulums swung by Mr. Baily in a vacuum apparatus, description of, 407. 
- results of the experiments with, 419. 
—- results of the experiments with, general view of, 431. 
- Mr. Baily’s additional experiments on, 438. 
- general results of Mr. Baily’s additional experiments on, 455. 
Perturbation of the Earth's longitude and radius vector, 68. 
- of the Earth in latitude, 113. 
- of Venus, 117. 
Pharynx, its functions as one of the organs of the human voice, 306. 
Physical Astronomy, researches in, .601. 
Placenta {human), on the structure of, and its connexion with the uterus, 57. 
Planetary theory, on the, 43. 
Planets, on the theory of the perturbations of, 195. 
Pneumatometer, a new instrument for ascertaining the quantity of respiration in animals, 
described, 324. 
R. 
Respiration and Irritability, theory of the inverse ratio which subsists between them, in 
the animal kingdom, 321. 
--nearly suspended in hybernation, 338. 
Reviviscence, from a state of hybernation, phenomena of, 355. 
Ritchie (Rev. William, LL.D.). Experimental researches in voltaic electricity and 
electro-magnetism, 279. 
S. 
Sensibility, not impaired in hybernation, 349. 
Smyth (Captain W. H.). Some remarks on an error respecting the site and origin of 
Graham Island, 255. 
Sphinx ligustri, Linn,, on the nervous system of, and on the changes which it undergoes 
during a part of the metamorphoses of the insect, 383. 
