160 INDEX*. 



tion of those relations of climate which are most favourable to 

 any of the more common cultivated plants, 266. Singular in- 

 stance of their vitality, 46S 



Plants, on the distribution of, xii. 338. Impressions of, taken 

 by lithography, 405 



on the geography of, xiii. 163 



• ' — experiments on the mode of circulation of the sap in, 



xvi. 388. On their epidermis, 391. Mode of union in their 

 vegetable structure, 392. On their air-vessels, ib. 



Plates (thin), chemical phenomena of, xiii. 426 



Plate-glass, purple tint of, affected by light, xvi. 164 



Platinum, how separable from other metallic substances found 

 with it, in the state of ore, i. 259 



fusion of, with the blow-pipe, ii. 107 



' — experiments on some combinations of, iii. 119. Ful- 

 minating, 135 



account of experiments on the sulphuret of, iv. 74. 



On the triple Salts of, 388. v. 64. Wire of ignited, 369 

 lampate of, vi. 322. Native, discovered in South 



America, 376 



alloys of, vii. 385 



leaf, notice of, ix. 411 



-^ sulphate of, a test for detecting gelatine, x. 454 



process for procuring ure platinum, palladium, rho- 



dium, iridum, and osmium, from the ores of, xii. 246. Re- 

 marks thereon, 256. On the oxide of, with gold, 412 



black enamel from, xiv. 229 



chromium detected in the ore of, xvi. 166. Hydriodic 



acid a test for, in solution, ib» Extraordinary experiment on 

 the ignition of, by a jet of hydrogen, 179. Its action on mix- 

 tures of oxygen, hydrogen, and other gases, 375 ; and its ap- 

 plication to their analysis, xvii. 277. xix. 101 



Pleometer, notice of, xiii. 220 



Player (R. P.), on the morbid influence of the spinal nerves, 

 xiv- 296 



Playfair (Professor), experiments of, for detei-mining the pro- 



