INDEX. 



577 





Cress, experiments with, 41. 



Crimea, bones from, 360. 



Cropped soils, nitrates in, 157 lost 

 by drainage in, 141. 



Crops, capacity of, for assimilating 

 manures, 486 ; difference in root- 

 sy stems of, 488 ; manuring of com- 

 mon farm, 493 - 530 ; period of 

 growth of, 489 ; potash removed 

 in, 218 ; suited for sewage, 434 ; 

 variation in composition of, 490. 



Crusius on phosphoric acid removed 

 from the farm, 207. 



Crust guanos, 308, 379. 



Crystalloids, 491. 



Cura?ao phosphates, 308, 330, 379. 



Darmstadt experiments with basic 

 slag, 410-413. 



Darwin on origin of nitrate-fields, 335. 



Daubeny on mineral sources of phos- 

 phoric acid, 200. 



Davy, Sir Humphry, lectures of, on 

 agricultural chemistry, 17-19 ; on 

 heat and water absorbing and re- 

 taining properties of soils, 57 ; on 

 hygroscopic power of soils, 99. 



Deherain, on nitrification, 52 ; on 

 nitrification in sulphate of am- 

 monia, 191 ; on rate of nitrification. 

 186. 



Denitrification, 177 ; conditions fav- 

 ourable for, 178 ; effected by bac- 

 teria, 178. 



Derby, Lord, introduction of Peruvian 

 guano by, 301. 



Detmer on humus in soil, 47. 



Dew, action of, on guano, 300 ; ex- 

 planation of, 77 ; most abundant 

 in summer, 78. 



Dicalcic phosphate, 387 ; formula of, 

 398; molecular composition of, 

 398 ; percentage composition of, 

 398. 



Digby, Sir Kenelm, on value of 

 nitrates to plants, 45 ; theory of, 

 on plant-food, 6-8. 



Diorite, phosphoric acid in, 202, 211. 



Direct manures, 113. 



Dissolved-bone compound, 372. 



Dissolved bones, 368; composition 

 of, 371. 



Dissolved guano, 310. 



Dolerite, phosphoric acid in, 202, 211 . 



Dolomite, phosphoric acid in, 202, 

 211. 



Downton experiments on sewage- 

 sludge, 439. 



Drainage, average of thirteen years, 

 160 ; nitrates in, 160 ; nitrates lost 

 by, 140 ; phosphoric acid lost by, 

 206 ; potash lost by, 217. 



Drainings of manure-heaps, analysis 

 of, 290. 



Dried blood, 424 ; composition of, 

 424 ; manure for sugar-cane, 425 ; 

 potash in, 219 ; rate of nitrification 

 in, 192 ; source of nitrogen, 152 ; 

 suited for horticulture, 425. 



Dried flesh, 425 ; nitrogen in, 425. 



Dried leaves, as litter, 242 ; compo- 

 sition of, 242 ; nitrogen in, 242 ; 

 phosphoric acid in, 242 ; potash in, 

 242. 



Ducks' dung, analysis of, 331. 



Duhamel and Hales, theory of, on 

 plant-growth, 8. 



Dundonald, Earl, treatise by, on agri- 

 cultural chemistry, 13. 



Dung and urine, composition of, 

 234. 



Dutrochet on absorption of plant - 

 food, 55. 



Dyer, Dr Bernard, analyses of stable 

 manure by, 283 ; experiments on 

 peat as litter, 240 ; on nitrate of 

 soda as manure for mangolds, 349. 



Earth, an adulterant of guano, 319 ; 

 composition of solid crust of, 102. 



Ecuador, guano deposits at, 327. 



Egyptian guano, nitrogen in, 329; 

 phosphoric acid in, 329. 



Elbe, waters of, phosphoric acid in, 

 206 ; potash in, 217. 



Elm-tree, water transpired by, 71. 



Enderbury Island guano, 309, 328; 

 phosphoric acid in, 328. 



Endosmosis, 55. 



English farming, 86. 



Equalised guano, 311. 



Essex, coprolites from, 374. 



Estremadura phosphate, 375. 



Ethylamine, nitrification in, 182. 



Evaporation from soil, 71, 72, 98. 



Excreta, amount of nitrogen in, 149, 

 292 ; composition of, 226, 292 ; dif- 

 ference in amount of, for food con- 



2 



