INDEX. 



579 



Flitcham experiments on growth of 



wheat, 500. 



Floated bones, 362, 365. 

 Florida phosphate, 378. 

 Fluorapatite, composition of, 210. 

 Food, consumed by pigs, 281 ; dry 



matter of, voided in dung, 228 ; 



percentage of, in excrements, 281. 

 Food-constituents, plant, necessary 



for nitrification, 170. . 

 Forbes, David, on nitrate - fields of 



Chili, 334. 

 Forest-soils, absence of nitrification 



in, 193. 

 Fowl-dung, 320, 326; analysis of, 



331. 

 Fownes on phosphoric acid in rocks, 



202. 

 Frankland, P. F., experiments on 



nitrification, 52, 167, 198. 

 Franklin, Benjamin, experiment of, 



with gypsum, 462. 

 Frey Bentos, meat-meal guano from, 



324. 



Gallopagos Islands, guano deposits 

 at, 327. 



Garden earth, absorptive power of, 

 98 ; ammonia in, 128. 



Gas-liquor, ammonia in, 353. 



Gas-works, ammonia from, 353, 358. 



Gases, absorbed by soils, 81 ; present 

 in soil, 100. 



Gazzeri on retention by soil of plant - 

 food, 57. 



Geese-dung, analysis of, 331. 



Geic acid in humus, 47. 



Gelatin, nitrification in, 182 ; from 

 bones, 364. 



Germany, agricultural research in, 

 32 ; bones imported from, 360 ; 

 manufacture of meat-meal guano 

 in, 324. 



Germination, influence of temperature 

 on, 76 ; oxygen necessary for, 81. 



Gilbert, Sir J. Henry, on barley- 

 manuring, 496 ; on Liebig's mineral 

 theory, 28 ; on manuring of po- 

 tatoes, 520 ; Presidential address 

 of, 61 ; and see Lawes and Gilbert. 



Glauber on artificial production of 

 nitre, 164. 



Glue, 364. 



Glycin, assimilated by plants, 47. 



Glycocoll, experiments with, 46. 



Gneiss, 106 ; phosphoric acid in, 207. 



Grandeau, Professor, on forms of 

 plant-food in soil, 107 ; on loss of 

 phosphoric acid, 207. 



Granite, 105 ; in guano, 303 ; phos- 

 phoric acid in. 202, 211 ; potash in, 

 214. 



Grass, Bangor experiments on, 508 ; 

 effect of manure on, 505 ; influence 

 of farmyard manure on, 506 ; man- 

 uring of, 504-510. 



Gray, Asa, on transpiration by plants, 



Great Cayman guano, 379. 



Green manures, 113. 



Grouven on guano, 313. 



Guanape Island guano, 302, 327 ; 

 nitrogen in, 329 ; phosphoric acid 

 in, 329. 



Guanine, 304 ; experiments with, 46. 



Guano, 293-331 ; action of, as a man- 

 ure, 312 ; adulteration of, 318 ; ap- 

 plication of, 315 ; bat, 325 ; com- 

 position of, 305, 329 ; crust, 308 ; 

 deposits of the world, 327 ; dis- 

 solved, 310; equalised, 309; fer- 

 mentation of, 299 ; fertilising con- 

 stituents in, 314; fish, 320-323; 

 importance of, in agriculture, 293 ; 

 inequality in composition of, 309 ; 

 influence of, on farming, 294 ; meat- 

 meal, 324 ; mode of application of, 

 315 ; nitrification in, rate of, 192 ; 

 nitrogenous, 300-308 ; origin of, 

 297; Peruvian, 300-306; phos- 

 phatic, 308 ; quantity to apply, 

 317 ; rectified, 311 ; so-called, 320 ; 

 source of phosphoric acid, 202 ; 

 source of potash, 219 ; value of, as 

 a manure, 296 ; variation in com- 

 position of, 299. 



Gulf of Mexico, guano deposits at, 

 328. 



Gulls, guano from, 297. 



Gunning on sources of plant-nitrogen, 

 42. 



Gunpowder, exports of, 149 ; nitrogen 

 lost in, 149 ; production, annual, 

 of, 149 ; saltpetre in, 149, 333. 



Gypsum, 462-464 ; absorptive power 

 of, 98 ; action of, mode of, 462 on 

 nitrification, 173 ; an adulterant of 

 guano, 319 ; as a fixer, 246, 247, 



