PEN 
195 
PEN 
Pearl ashes, method of manufactu-||Pendulum, W. J. Frodsham’s ime 
ring, G. A. Rogers, viii, 304. 
Pearls and pearl fishery, xxxii, 56, 
68. 
in fluviatile shells, xxv, 257. 
Pearson’s Domestic Telegraph, iv, 
314.6 © 
Peat, on the use and mode of for- 
mation of, EL. North, xi, 67. 
, on the origin, preparation and 
uses of, from a memoir by Ri- 
baucourt, xv, 250. 
, gas light from, xxx, 189. 
, Instance of bituminization of, 
in Maine, C. T. Jackson, xxxiv, 
73. 
, 1n Massachusetts, xxii, 38. 
, in New York, i, 189; v, 8; 
xxxvi, 16. 
moss, mode of determination 
of age of, xxix, 349. 
Peat-bogs, observations on, G. H. 
Adams, xxxviii, 127. 
Peck, J., geology of the mining 
districts in Georgia,western North 
Carolina and East ‘Tennessee, 
with a map, xxii, Ll. 
Pecten, uses and economical notice 
of, xxxii, 248, 249. 
Pectic acid, converted to oxalic, 
xvii, 179. 
Peirce, B., elements of the third 
comet of 1845, xlix, 220. 
Peligot, E., on tea, xlviii, 187. 
Pelletier, on guaiac resin, xlix, 
194. 
Peloconite, new mineral species, 
Xxil, 387; xxvi, 386. 
Pelopium, new metal, xlviii, 400. 
Pelouze, J., on tannin, xxviii, 124. 
, on the atomic weights of sim- 
ple bodies, xlvii, 188. 
, on the solubility of chlorine 
in water, xlvii, 191. 
Peltier, on tornadoes, xxxvili, 401. 
Pendulum, new compensating, W. 
G. Jones, xxxviii, 274. 
of, with different suspending 
springs, W. J. Frodsham, xxxvii, 
278. . 
» experiments on the vibrations. 
proved compound, xxxviii, 107. 
, portable mercurial, E..J.Dent, 
xxxv, 289, 
, Vibrations of a mercurial, G. 
Baker, x\viii, 156. 
, barometric compensation of, 
xlvi, 393. 
, oscillations in the plane of 
the meridian and at right angles 
with the same, different, xxviii, 
62. 
, simultaneous motions of the 
surrounding air and, S. D. Pois- 
son, xxill, 391. 
, E. Sabine’s experiments with, 
and conclusions, xvii, 364. 
, on the reduetion to a vacuum 
of the vibrations of an invariable, 
XV1l, 365. 
Penetrativeness of fluids, xix, 360. 
Penguins, habits of, xlix, 151. 
Pennant, Thos., life and writings 
of, xxxvil, 146. i 
Pennatule fléche, iv, 87.f 
Pennine, form and analysis of, xlvii, 
216. 
Pennsylvania, coal beds of Wyo- 
ming, Z. Cist, iv, 1.f 
< —— ——, rocks ac- 
companying, vil, 260. 
; , remarks on the prop- 
erties and economical uses of 
anthracite, B. Silliman, x, 3381; 
—characters, 332; experiments 
on, 333; uses of, in the arts, 337 ; 
mode of burning, 238, 341 ; com- 
parative value of Lehigh and 
Schuylkill, 8339; price in New 
York, 340; general qualities of, 
343; documents relating to the 
value of, 346. 
, , characters of anthra- 
cite, B. Silliman, xi, 91 ;—analy- 
sis of the Lehigh by L. Vanuxem, 
93; directions as to burning, 94; 
remarks on M. Bull’s memoir on 
the heating power of fuels, 98. 
, coal; value, position, extent, 
&c., of anthracite, J. Pierce, xii, 
54, 
