44 



GENERAL INDEX OF VOLS. 1 12 OF THE 



150 ; discovery of in France, v. 158 ; 

 ix. 232, 314. 



Platinum, muriate of, action of light in 

 determining its precipitation by lime- 

 water, i. 58. 



Platypus, on the habits of the, ii. 71. 



Plenakite, new locality of, vii. 239 ; ana- 

 lysis of, vii. 540. 



Plombgomme, analysis of, ix. 75. 



Plumbago, conversion of iron into, xi. 321. 



Poggendorff (M.) on certain discoveries 

 by Prof. Faraday, vii. 421. 



Poggiale, (M.) on the active principle of 

 sarsaparilla, v. 463. 



Poison, the Ipoh or Upas, used by the 

 Jacoons, xi. 193. 



Poisson's (M.) capillary theory on, viii. 89. 



Polariscope, simple, viii. 70. 



Polarity, magnetic in metallic bodies, i.31. 



Polarization :— of heat, vi. 134, 205, 284, 

 366 ; vii. 349 ; cause of elliptical, xii. 

 10 ; in the crystalline lens after death, 

 xii. 22 ; of heat by tourmaline and by 

 refraction, xii. 549 ; by reflection, xii. 

 553. 



Polarizing microscope, ix. 288. 



Polygalic acid, xi. 561 ; modified, xi. 562. 



Polyhetkon, solid, on certain relations in 

 a, xii. 323. 



Polypi, on the structure and functions of, 

 iv. 365 ; on the structure of the higher 

 forms of, xi. 189. 



Polyspherite, v. 78. 



Pond (J.) on the new zenith telescope at 

 the Royal Observatory, iv. 367 ; notice 

 of, X. 146. 



Pons (J. L.), notice of the death of, i. 

 239. 



Population of Great Britain, comparative 

 account of the, i. 213, 361. 



Porcelain earth, composition and origin 

 of, X. 348. 



Portlock (Capt.) on the occurrence of 

 Anatifa vitrea on the Irish coast, xi. 

 135 ; on the habits of the short-eared 

 owl, xii. 104. 



Port Louis, meteorological deductions 

 made at, xi. 97. 



Potash, preparation of chlorate of, i. 164 ; 

 preparation of caustic, i. 244 ; car- 

 bonate of, from plants, iii. 72 ; action 

 of lime on solutions of, iii. 314; per- 

 manganesiate of, iv. 155 ; chromate of, 

 physical and therapeutic properties of, 

 V 238 ; crystallized hydrate of, ix. 151 ; 

 carbovinate of, xi. 320 ; bicarbonate 

 of, its preparation, xii. 216; on the 

 equivalent of, xii. 324 ; and oxalate 

 of chromium, optical properties of, vii. 

 436. 



Potatoe starch, viii. 586. 



Potassium, experiments with, iv. 318; 

 cyanuret of, v. 465 ; ferrocyanuret of, 

 and dilute sul]»hurie acid, reaction of, 

 vi. 97 ; chloride of, ix. 232 ; chloride 

 of, detection of salt in, xii. 130 ; cya- 

 nide of, as produced in hot-blast fur- 

 naces, X. 329 ; ferrocyanide of, its 

 action on sulphovinates and sulpho- 

 methylates, xii. 102; and mercury, 

 bromo-cyanide and chloro-cyanide of, 

 xi. 340. 



Potter (R. jnn.) on giving conic sectional 

 figures to lenses, &c., i. 55 ; on the 

 reflexion at the second surface of flint 

 glass at incidences of total reflexion, 

 i. 57 ; on a new photometer by com- 

 parison, i. 174; rejdy to Mr. Wheeler 

 respecting, xii. 484 ; on a particular 

 modification of the interference of ho- 

 mogeneous light, ii. 83 ; Prof. Airy's 

 remarks on, ii. 161 ; reply to Prof. 

 Airy, ii. 276 ; Prof. Hamilton in reply 

 to Mr. Potter, ii. 371 ; on a new he- 

 liostat, ii. 6 ; on two arches of aurorae 

 boreales, ii. 233 ; on a brilliant arch of 

 an aurora borealis, iii. 422 ; on the ve- 

 locity with which light traverses trans- 

 parent media, iii. 333 ; on the reflexion 

 of light by glass of antimony, iv. 6. 

 Powell (Rev. B.) on experiments relative 

 to the interference of light, i. 433 ; on 

 the inflexion of light, ii. 424 ; on the 

 undulatory theory of light, vi. 16, 107, 

 189, 262 ; on the repulsive power of 

 heat, vi. 58 ; on the achromatism of 

 the eye, vi. 247 ; on the dispersion of 

 light, vi. 374; on M. Cauchy's theory 

 of the dispersion of light, viii. 24, 204, 

 305 ; on the theory of dispersion, viii. 

 112, 413; X. 221; xi. 477 ; xii. 367; 

 on prismatic dispersion, vii. 293 ; on 

 recent discoveries relative to radiant 

 heat, vii. 296 ; remarks on M.Melloni's 

 paper on the transmission of calorific 

 rays, viii. 23 ; note on the transmission 

 of radiant heat, viii. 186; on the for- 

 mula for the dispersion of light, ix. 116; 

 X. 221 ; on repulsion by heat, &c.,xii. 

 317; on Von Wrede's explanation of 

 the absorption of light by the undu- 

 latory theory, xii. 114. 

 Pratt (Rev. J. H.), demonstration of the 

 parallelogram of forces, v. 39 ; im- 

 provement in Henslow's clinometer, v. 

 159; on the proposition that a func- 

 tion of 9 and -^ can be developed in 



^ only one series of Laplace's coefficients, 

 viii. 474 ; demonstration of a proposi- 

 tion in the Mecanique Celeste, remaiks 

 on, ix. 84 ; reply to, ix. 254 ; on the 

 equilibrium of fluids, xii. 385. 



