VOLUMES ONE TO TWENTY-FIVE. 



141 



PnosrHO Peruvian guano, its nature, 

 analysis, and use for swedes (Dr. Voelc- 

 ker), xix. 171. 



Phosphatic rocks of the Anguilla isles 

 (Sii- E. I. Miu-ehisou), xx. ;]1. 



■ materials used ibr agricultural 



purposes, tlu'ir chemical composition 

 and conuuercial value (Dr. Voelcker), 

 xxi. 350 ; sources of phosphates, ih. ; 

 superphosphate of Imie, ih. ; nitro- 

 genous fertilisers, 351 ; phosphorus in 

 albumtuous compounds, ib. ; effects of 

 phosjdiates on roots and cereals, 352 ; 

 A^orwegian apatite, where found, 353 ; 

 its analysis and percentage of phos- 

 jihate, 354 ; Spanish phosphorite (Estra- 

 madru'a phosphate), its use as building- 

 stone, ii^G ; analysis, ib. ; fibrous or 

 Bavarian phosphorite, 350; osteolith, 

 357; Cambridgeshire coprolites, their 

 composition, 357 ; mode of analysis, 

 ib. ; how to treat coprolites, 358 ; Suf- 

 folk, jiscudo or false, coprolites, de- 

 scribed by Dr. Buckland, 359 ; their 

 colour, consistencj', and composition, ih. ; 

 their conversion into manure by M. 

 Ivoblique's j^rocess, 3G0 ; American phos- 

 ])hate, IMaracaibo, Monk's Island, or 

 Columbian guano, 361 ; its composition 

 and value, 362 ; Sombrero rock or crust 

 guano, ih. ; its aiialysis, 363 ; composi- 

 tion of Kooria Mooria guano, 364 ; 

 African and West Indian ijhosiihatic 

 guanos, 365 ; South American bone-ash, 

 ■ih. ; its analysis, 366 ; variations in bone 

 constituents, 367 ; defective analyses, ih. ; 

 chemical formula of pure bone-ash 

 (Heintz), 368, and bone-earth, 368-9; 

 fluorine in bones, 369 ; the caustic am- 

 monia test, ih. ; errors in commercial 

 analyses made by precipit;;tion, 370 ; 

 illustrations, 371 ; percentage of phos- 

 phoric acid, the real measure of value, 

 ib. • the author's method cf analysis, 

 372 ; tests of its accuracy, 373, agree- 

 ment of independent analyses, ib. ; ex- 

 planation of results, 374 ; analysis of 

 South'American bone-ash, 375 ; how to 

 conduct and state analy.sis for practical 

 use, ib. ; compo.sition of pure bone-ash, 

 376 ; table of analytical results and ex- 

 planation, 377 ; percentage of phos- 

 phate, 378; animal charcoal or bone- 

 black, ih. : its analysis, 379 ; treatment 

 of bones before crushing, ib. ■ composi- 

 tion of sound, decayed, and boiled 

 bones, 380; and of bune sliavings, 

 381. 



PiiosPHOiiic acid, chemical properties of 

 (Hemming), xiii. 431 ; its presence in 

 igneous rocks, xvii. 466. 



Phospiiofjc acid, its small waste in drain- 

 age water (J. T. Way), xvii. 140. 



strata of the chalk formation, on, 



by T. M. Paine and J. T. Way, ix. 56. 



Phosphohite, on the occiu'rence of, in 

 Estramadura, by Dr. C. Daubeny and 

 Captain Widdrington, v. 406 ; it occurs 

 in the clay-slate formation, 411 ; ana- 

 lysis of one of the specimens, 414. 



, on its use as a manure (Daubeny), 



vi. 329. 



■ , in the ash of bran, malt-combs, and 



rape-cake, xviii. 159. 



, its absorption of, by soils (Dr. 



Voelcker), xx. 140 ; its influence on 

 germination, xxiv. 44. 



, Spanish, on the use of, and other 



manures, by Sir H. Verney, vi. 331. 



, Spanish, on the American and 



other native phosphates of Imie, by 

 J. Hudson, xii. 249 ; the apatite, 

 253; analysis of si^ccimens from Nor- 

 way, Spain, and the Tyrol, 254. 



Phosphorite, Spanish, or Estramadura 

 phosphate (Dr. Voelcker), xxi. 355. 



, fibrous or Bavarian (Dr. Voelcker), 



xxi. 356. 



Phosphorus of vegetables CBowditch), 

 xvi. 338. 



Phosphitretted hydrogen, emission of, 

 by decomposing animal matter (Bow- 

 ditch), xvi. 340. 



Phragmite communis, sec " Common 

 reed." 



Physiology of vegetation, see " Vege- 

 table physiolog}'." 



Pickering, the vale of (Henderson), xiv. 

 133 ; on the Kimmeridge clay, iJ). 



Piecework, see "Taskwork.' 



, payanent for, in Berks (Spearing), 



xxi. 43. 



Peerson, J., on burning land for manure, 

 viii. 77. 



Pigeons, on tlie rearing and management 

 of, by W. Trotter, xii. 196. 



, the dung of, its analyses, xiii. 482. 



PiGEONs'-DUNG, employed in Flanders as a 

 top-dressing for flax (Rliam), ii. 312; 

 the value of that from 100 pigeons, ih. 



PiGGERY', on the construction of, xi. L'O;'. 

 (Tanered) ; (Ewart), 259. 



PiG-NtT, its habit and jirevalenco iu Bed- 

 fordshire, xviii. 14. 



Pigs, how a cottager may profitably kcip 

 one (Main), ii. 337. 



, a pig which lived 160 days witliont 



food, iv. 224; effect of manifestation 

 of force, 225; fattening animals ke])t 

 i'rom moving, ih. ; experiment with 

 .some pigs, ib.; Mr. Morton's trials 

 with fattening pigs (Playfair), 233. 



