PLA 
Plants, carbonic acid disengaged by 
the roots of, xlv, 227. 
bonic acid by, xxxiv, 44. 
, circulation in, £. Emmons, 
xxvl, 99. 
. of sap in, xix, 393. 
, chemistry of, J Liedig, 
levelededie 
, chemical constitution of cel- 
lular and woody tissue in, xl, 
176. 
, cultivation of, in moss, xiii, 
189. 
, crystalline substances from 
the juice of, xi, 391. 
,crystalsin, Turpin, xix, 177; 
xx, 382. 
, crystals of oxalate of lime 
in, xx, 883; xxi, 372. 
, crystals in the tissues of, J. 
W. Bailey, xlv, 149; xlviii, 
17.f 
, effect of light on the color 
and movements tok: ID IE Gard-| 
ner, x\vi, 1.f 
, effect of light on the germi- 
nation of the seeds of, xliv, 352. 
on the growth of, 
Ry, 352; xIvi, 397; xlvii, 194. 
, experiments on inorganic ele- 
ments of, xlvii, 194. 
, effect of climate on geogra- 
phy of, xlvii, 221. 
, effect of frost of the winter 
of 1837-8 in England, upon, J. 
Lindley, xxxix, 18. 
9 
on, xvil, 388. 
J. Buel, xxviii, 267. 
, experiments on garden, J. 
T. Plummer, x\, 197. 
cases, xlill, 383. 
, growing under 
Daubeny, xxxiv, 11. 
glass, C. 
é ibid; adNiKaBe 
XXXIVE Le 
; ibid, J. Yates, xxxiv,| 
13. 
202 
, non-decomposition of car-| 
of chemical solutions) 
, excrementitious matter from, | 
, growth of, in closely glazed) 
Ward,| 
PPL ss 
Plants, growing on animals, S. L. 
Mitchill, xii, 21. 
, on the development of the 
external organs of, xxxvii, 187. 
, on the leafing of, xliv, 419. 
, Indicators of seasons, ii, 255. 
——., phosphorescent, xv, 170. 
——.,, phosphoric acid in, il, 358. 
——,, poisoning of, xv, 169. 
, respiration in, xxii, 363. 
, sleep of, xxi, 375. 
, used for cordage, xxi, 27; 
xxv, 330; xxviii, 371; xli, 200.f 
| and mosses, iodine in, xlv,227. 
, fossil, accompanying anthra- 
cite coal, ix, 165. 
: , at Mariner’s Mill, Ohio, 
xxxi, 28.f 
, in coal strata of Eng- 
lands ill, 3889 5; xxxil, 87, 270. 
-——, , of the chal formations, 
A. Brongniart, iv, 266.f 
; , analysis of Ad. Brong- 
niart’s work on, vii, 178. 
, see farther under Botany 
and Vegetable. 
Plaster, on the setting of, xvii, 371. 
of Paris, see Gypsum. 
Plastic clay of the southeast of 
England, xxxii, 92. 
and sand formation of 
New Jersey, Massachusetts coast, 
and elsewhere, vil, 34, 214, 244. 
Plate electrical machine, R. Hare, 
vii, LO8f; xxxii, 272.f 
, vill, 378. 
Platinum, size of grains of, xvi, 389. 
, price of, (1833,) xxvi, 210. 
, Imitation of, xxii, 383. 
,on the fusion of, R. Hare, 
il, 295; xxxul, 1953 xxxv, 3285 
xxxviii, 155, 168. 
, test for, vi, 376. 
, amalgam of, xxvii, 363. 
| , action of, on combustible gas- 
| es mixed with oxygen, xii, 181. 
mines, found in the Ural, Rus- 
sia, xli, 884; xiv, 204; xvili, 
190; xxviii, 395. 
of Russia, large masses, XV], 
389 ; xlvi, 212. 
| 
