Bhs 
Pierce, J., on the geology, mineral- 
ogy, &c. of the Highlands of New 
York and New Jersey, v, 26. 
, geology, scenery, &c. of the 
Catskill Mountains, vi, 86. 
, notice of the alluvial district 
of New Jersey, with remarks on 
the marl, vi, 237. 
, an excursion among the 
White Mountains and up Mount 
Washington, vill, 172. 
, agriculture, geology, &c. of 
the Floridas, ix, 119. 
——., topography, resources, Wc. 
of Michigan, x, 304. 
—-, Virginia, shell marl and coal 
regions of, xi, 54. 
; mineral resources of Penn- 
sylvania, xl, 54. 
Pierce, L., notice of a halo, x, 369. 
Pierpont, J., meteorological notes 
in 1692, xlii, 399. 
Pig, anecdote of, xlvi, 243. 
Pigeons, flight of, in Ohio, S. P. 
Hildreth, xxiv, 134, 136; xl, 348. 
, roosts of, in Ohio, xl, 348. 
—-, mode of decoying, xvi, 373. 
Pigment for the pallet, xvi, 174. 
Pilatus, Mount, slide of, ili, 868. 
Pimelite in Vermont, vill, 234. 
Pine timber, strength of, xix, 228.f 
Pinguite, new mineral species, xx, 
OZ 
Pinite in Massachusetts, ix, 48. 
——- (chlorophyllite) in Connecti- 
cut, vi, 219; xli, 354. 
not at Bellows Falls, Vt., xi, 
384. 
Pink dye, from the flower of the 
sweet balm, xxv, 413. 
Pipa, xi, 271. 
Piperine, use of, G. W. Carpenter, 
xill, 3826. 
, notice of, TZ. G. Clemson, 
201 
XViil, 352. 
Piper leptostachyum, v, 287. 
Pipes, iron conduit, vi, 173. 
Pipestone, red, of the Coteau des 
Prairies, xxxvil, 893 5 xxxviii,138, 
Pirira, on salicine, xlix, 392. 
Pisa, notice of, iv, 383. 
PLA 
Pisolite in Massachusetts, ii, 238. 
Pisolitic balls, xliv, 283.f 
Piston, Cooper’s rotative, xvi, 313.f 
Pittsburg, Pennsylvania, account of, 
S. P. Hildreth, xxix, 68, 79. 
Pixit, rotating magnetic machine, 
xxiv, 144, 146f, 196. 
Plague in Constantinople, remarks 
on, Xxxlv, 32. 
Planes, inclined, in the construction 
of rail roads, J. Thomson,xxiii, 107. 
Planera, or Siberian elm, notice of, 
Dey ONT Te 
Planet, supposed new, beyond Her- 
schel, Cacciatore, xxxi, 158. 
Jupiter and his satellites, 
Struve, xii, 173. 
Saturn, xiii, 172; xvii, 162; 
xxv, 1913 xxxvil, 373; xliv, 388. 
, sixth satellite of, xxxiv, 
207. 
— Venus, P. F. de Vico, xliv, 
377, 383. 
, rotation of, xxiv, 204. 
Planets moving in a resisting me- 
dium, examination of the theory 
of, R. W. Haskins, xxxiii, 1. 
, Ibid, remarks on, xvii, 389. 
, sizes of, xxxiil, 17. 
——,, motion of,represented,xii, 103. 
» comparative oblateness of, 
SOs Pape 
Planetarium, Russell’s, xlii, 400. 
Planetary spaces, temperature of, 
KOCK ML EX XIV Ode 
‘Planorbis, see Zootocy, Mollusca. 
Plants, number of known species, 
mlix, 172: 
of New York, number of in- 
digenous, J. Torrey, x|, 77. 
, classification of, according to 
a natural system, Robert Brown, 
i, 435. 
, grand division, into exogens, 
endogens and acrogens,xxxii,295, 
, other subdivisions, xxxii, 296, 
299: 
, soul or spiritual life of, C. 
F. P. von Martius, xl, 170. 
ammonia disengaged by grow- 
ing, x, 190. 
