INDEX. 155 



Pendulums, remarks on, vii. 308 



. Captain Sabine's experiments for determining the ac- 

 celeration of, in different latitudes, xii. 363 

 ' mean length of, vibrating seconds at Madras, xiv. 170 



Penitentiary at Millbank, account of the fumigation of, xviii. 92 



Penn (Granville, Esq.) analysis of his comparative estimate of 

 the mineral and Mosaical geologies, xv. 108. Supplement to, 

 xvi. 309 



Pepper, factitious, remarks on, iii. 188 



Pepys (W. H., Esq.) on a new construction of the voltaic ap- 

 paratus, i. 193. XV. 143. 



■ improved apparatus for the manufacture of soda-water, 

 iv. 358 



Perception and idea, homogeneous nature of, iii. 6 

 Perkins (Mr.), his process for engraving upon steel, ix. 125 

 on the compressibility of water, x. 399 



change of fat in his engine, by water, heat, and pressure, 



xvi. 172 



contrivance of, for warming houses and other buildings, 



xviii. 336 



Peron (M.), historical notice of, ii. 294. His birth and edu- 

 cation, ib» Enters the republican army, 295. Studies medi- 

 cine and natural history, ib. 296. Engages in an expedition 

 to the South-Seas as a zoologist, ib. Account of his re- 

 searches and discoveries, 29 S. Returns to France, ib. Result 

 of his labours, 301. General character of the published nar- 

 rative of his voyage, 302. Notice of his unpublished works, 

 303. His character, 304. Anecdotes of his integrity, 306. 

 Last illness and death, 307. Analysis of the second volume of 

 his Voyage de Decouvertes aux Terres Australes, 382 



Persia, mode of purifying silver in, viii. 160. Steel, how pre- 

 pared there, 161 



Persulphate of iron and ammonia, component parts of, xv. 38 1 



Peruvian bark, extraordinary effects of, viii. 182 



■ substitute for, x. 194. Chemical researches on, 

 388 



