INDEX. 



591 



Tetracalcic phosphate, 387 ; occur- 

 rence of, 387, 405 ; solubility of, 

 387. 



Thaer on application of farmyard 

 manure, 275. 



Thiocyanates, nitrification in, 182. 



Thomas - Gilchrist process of steel- 

 smelting, 402. 



Thomas-slag. See Basic slag. 



Tillage increases number of plants, 86. 



Timor Island guano, 309. 



Tobacco, potash in, 217. 



Torrefied horn, 426. 



Torrefied leather, 428. 



Tortola guano, 309. 



Trachyte, phosphoric acid in, 202, 211. 



Transpiration, by elm-tree, 71 ; by 

 oak-tree, 71. 



Trees, as pumping-engines, 76 ; water 

 transpired by, 71. 



Tricalcic phosphate, 386, 398. 



Tubercles on roots of plants, 44. 



Tull, Jethro, theory of, on plant- 

 growth, 9-11, 69, 109. 



Turkey, dung produced by, 331. 



Turnips, fertilising ingredients re- 

 moved from soil by, 485 ; manurial 

 constituents in, 282 ; manuring of, 

 510, 511, 513 - 517 ; Kothamsted 

 experiments on growth of, 568. 



Twigs, potash in, 217. 



Tyrosin, assimilated by plants, 47. 



Ulmates in farmyard manure, 259. 

 Ulmic acid, in farmyard manure, 258 ; 



in humus, 47. 

 Ulmin in humus, 47. 

 Uncovered farmyard manure, 263, 



289. 

 Unexhausted manures, valuation of, 



549-552, 558. 

 Unit value of manurial ingredients, 



544. 

 Units for determining commercial 



value of manures, 554. 

 Urate of ammonium in Chincha Is- 

 land guano, 305. 

 Urea, assimilated by plants, 46 ; in 



farmyard manure, 257 ; nitrification 



in, 182. 

 Uric acid, experiments with, 46 ; in 



Chincha Island guano, 305. 

 Urine, 228 ; amount voided, 291 ; 



composition of, varies, 228 ; con- 



tains digested manurial ingredients, 

 228, 232 ; devoid of phosphoric acid, 

 205 ; and dung, composition of, 

 234 ; influence of food on, 229 ; 

 nitrification in, 197 ; nitrogen in, 

 292 ; potash in, 292 ; voided by 

 cows, 280 ; voided by oxen, 280 ; 

 voided by pigs, 281 ; voided by 

 sheep, 280. 

 Uruguay, meat-meal guano from, 324. 



Valuation of manures, 539-559. 



Vegetation, desirable to have soil cov- 

 ered with, 194. 



Venezuela, guano deposits at, 327. 



Ville, Georges, on assimilation of 

 ammonia, 50 ; theory of, on source 

 of plant-nitrogen, 41. 



Vine, potash removed by, 216. 



Virgin soils, 133. 



Voelcker, Dr, analysis of apatite, 210 

 of farmyard manure, 259 ; on 

 action of superphosphate, 395 ; on 

 fresh and rotted dung, 261, 286 ; on 

 guano, 316 ; on salt as a manure, 

 473. 



Voss, Hermann, on manures used, 

 152. 



Wagner, Professor, on, application of 

 basic slag, 416 ; assimilation of 

 organic nitrogen, 46 ; experiments 

 with basic slag, 408-413 ; fineness 

 of basic slag, 409 ; manures, 412 ; 

 relative manurial value of nitrogen 

 compounds, 556 ; solubility of basic 

 slag, 408. 



Wallace, Dr, on sewage purification, 

 436. 



Walruses, guano from, 297. 



Warington, E., on ammonia in rain, 

 49 ; on appearance of nitrous organ- 

 isms, 168 ; on conditions favourable 

 for nitrification, 181 ; experiments 

 on rate of nitrification, 186 ; on 

 composition of farmyard manure, 

 260 ; on manufacture of superphos- 

 phate, 383 ; on manurial constitu- 

 ents of foods, 282 ; on nitrification 

 in alkaline solutions, 197 ; on ni- 

 trogen in excrements, 233 ; on ni- 

 trogen in soil, 122 ; on potash in 

 wool, 227 ; researches of, on nitrifica- 

 tion, 35, 52, 166-168, 180, 186. 



