POL 
Poisons, action of, on vegetables, 
xii, 196; xv, 169. 
Poisonous confectionary, Xvill, 157. 
Poisson, S. D., on the temperature 
of the earth, atmosphere and of 
space, Xxxlv, 97. 
, death of, xl, 220. 
Poland, a history of, published by 
N. Rosenfield, vi, 390. 
Polanisia, 1, 378. 
Polar, north, fogs of, xiv, 378. 
on account of explora- 
tions, 1, 101; xvi, 124. 
Polariscope, for polarized light, xv, 
, natural, of tourmaline in 
mica, B. Silliman, Jr., xlvi, 
418. 
Polarity, new kind of, in light, D. 
Brewster, xxxv, 292. 
of molecules in crystallization, 
J. D. Dana, xxx, 275.f 
, electric, see under Electri- 
cily. 
Polarization of heat, 
397. 
XXvill, 366, 
FevD: 
, remarks 
Forbes, x\, 317. 
on, 
Brewster, xxii, 277. 
by refraction, laws of, D. 
Brewster, xxiii, 28, 227.£ 
, use of mica in, i D. Forbes, 
xxxviii, 101. 
, elliptical, of reflected light, 
B. Powell, xliv, 171; xlvi, 390. 
——, auroral light without, J. Hen- 
ry, XXxix, 366. 
Polarized rings produced in speci- 
mens of decomposed glass, D. 
Brewster, x\, 325. 
light, exhibited by means 
of oxy-hydrogen microscope,| 
xxxviil, 102. 
Polarizing rocks, xx, 198. 
Pole, north, attempts to discover, 
i, 101. 
Polishing of granite, iv, 2463 viii, 
185. 
Pollen, analysis of, MM. Prinsep,' 
xviii, 402, 
204 
of light by reflection, D.) 
—— of © Manchester, 
POP 
Pollen, yellow showers of, xxxix, 
399 ; xlii, 195. 
=— —— examined by J: 
Nay Bailey, xiii, 196.f 
Polycrase, a new mineral species, 
xlix, 394. 
Polygons, on the measure of, G. C. 
Whitlock, xlvii, 380.f 
‘Polyhydrite, xlii, 386. 
Polynesian Islands, new work on, 
xxix, 290. 
Polynomials, involution of, W. J. 
Lewis, xlii, 239. 
‘Polyps, a group of, v, 46. 
Polytechnic Institute of Vienna, x, 
379. 
Society of Paris, xxiv, 191. 
\Polythalamia, American, xli, 400.f 
, fossil, in the United States, 
J. W. Bailey, xliviii, 102, 340.f 
; from Petersburg, Va., 
Sie W. iBatlens xlv, 313. 
: , from the Upper Mis- 
sissippi, We Bailey, xii, 400.£ 
Pomeroy, S. W., remarks on the 
coal formation of Pennsylvania, 
Xxl, 343. 
‘Pompeii, how covered, iii, 374. 
, excavation of, iv, 384. 
Pompton Mountains, N. J., rocks of, 
v, 24]. 
Pond, a fermenting, v, 199. 
Ponton, M., on paper for photo- 
graphy, xxxvil, 361. 
Poor, education of, ili, 379. 
Popocatepetl, ascent 
220. 
of, 
XXVIIl, 
Population of France, xv, 397. 
—— of Glasgow, proportion of 
males to females, xxviii, 80. 
of Great Britain, xxiv, 211. 
England, 
xxviii, 80. 
—— of Prussia, ix, 184. 
—— of Russia, iv, 389. 
—— and religion of Russia, xv, 
397. 
of Sweden, in 1816, 17, 18, 
ii, 347. 
of the United States at the 
earliest census, xxxiil, 278. 
