PLU 
Platinum, large mass of, from Pe- 
ru, iv, 28; xvi, 389. 
, analysis of the Russian, J. J. 
Berzelius, xviii, 162. 
, in France, xxvi, 389. 
boilers, at Paris, xvii, 179. 
lamp, xx, 385, 
wire, ignited, i, 309. 
, action of heated, on 
combustible gases, W. Henry, 
xil, 181. 
, spongy, combustion with, dis- 
covered by J. W. Dobereiner, 
Vii, 387. 
; .J. W. Dobereiner’s re- 
searches on, xviii, 151. 
, J. Liebig, xviii, 398. 
SSS, , action of, prevented 
by certain gases, xxxi, 348. 
Kuhlmann, 
b) 
Xxxvil, 198. 
, on the dark precipitate of, J. 
Liebig, xviii, 398. 
, new compounds of, J. W. 
Dobereiner, xxviii, 130. 
,»a_ bDichloride of, combined 
with deutoxide of nitrogen, H. D. 
Rogers, xxxvill, 186; xxxix, 369. 
, a property of asbestus imbu- 
ed with chloride of, xx, 160. 
, chloriodide of, W. W. Math- 
er, XXvil, 208. 
and hydrogen, no combination 
of, J. W. Dobereiner, xxxiv, 207. 
and soda, a double sulphite of 
the protoxide of, A. Litton and 
Schnederman, xliv, 274. 
, lodide of potassium and, W. 
W. Mather, xxvii, 257. 
Plesiosaurus, from north of Whitby, 
England, xxix, 364. 
» notice of, xvii, 289. 
Plessy, on the hydrosulphite of 
soda, xlix, 200. 
Pleurodon, R. Owen, xliv, 342. 
Pliny, on the influence of the ash 
on reptiles, xxx, 268. 
Plough, American, compared with 
French, vii, 190. 
Plumbagine, a new vegetable sub- 
stance, xvil, 385. 
’ 
203 
PO! 
Plumbago formed by pressure, xlix, 
Lai. 
, see Graphite. 
Plumbago floridana, v, 290. 
Plumbocalcite, new mineral species, 
xxvi, 386. 
Plummer, J. T., miscellaneous ob- 
servations on insects, xl, 146. 
, motion of particles of melted 
spermaceti of a burning candle, 
xl, 148. 
, suburban geology, (Indiana) 
xliv, 281.f 
, fucoids in Indiana, xliv, 290.f 
, scraps in natural history, xlvi, 
236; xlvii, 938. 
——, horticultural experiments, xl, 
Loe 
——, on the dry-rot, xlii, 197. 
, combustibility of wood ashes, 
xlii, 167.f 
, on a dangerous property of 
_ wood ashes, xliii, 80. 
Plumose mica, 1, 141. 
Pluranium, announced as a new 
metal, from the Ural, xvi, 384. 
Pluviometrical observations, see un- 
der Rain and Meteorological. 
Pneumatic cistern of R. Hare, xiv, 
200f; xxxiii, 246.f 
paradox, on the true theory 
of, J. H. Abbot, xxxix, 296'; xl, 
144 f 
Poa modesta, xlv, 45. 
Poacites, fossil plants, generic char- 
acters of, vii, 182. 
Poem, geological, v, 272. 
Poison of the Argas persicus, xxxiii, 
20a. 
, Senecio obovatus poison to 
sheep, xv, 358. 
of the common toad, xiv, 373. 
Poisons, animal, ii, 168. 
, antidotes for, 11, 358. 
, salt a remedy for, xxi, 
b) 
9 
158. 
, ammonia an antidote 
against, xvi, 182. 
» ——, the Uvularia perfoliata 
a remedy for, B. H. Coates, 
xxxv, 270. 
