INDEX. 



589 



Schulze on fixers, 246. 



Scutch, 427 ; manufacture of, 427 ; ni- 

 trogen in, 427. 



Sea- weed, nitric acid in, 339. 



Seals, guano from, 297. 



Seed, fertilising ingredients lodge in, 

 491. 



Seine, nitrates in waters of, 158. 



Senebier, Jean, on carbon in plants, 

 12 ; on nitrogen in plants, 41. 



Sewage, 430-441 ; charcoal a filter for, 

 437; crops suited for, 434; de- 

 nitrification in, 179 ; dry matter 

 in, 431 ; effects of continued appli- 

 cations of, 433 ; filters for, 437 ; 

 irrigation with, 431-433 ; nitrifica- 

 tion in, 166 ; nitrogen lost in, 149 ; 

 phosphoric acid lost in, 149 ; puri- 

 fied by soils, 435 ; treatment of, by 

 precipitation, 436 ; value of, as a 

 manure, 430. 



Sewage-sick land, 433. 



Sewage-sludge, 438-441 ; as a manure, 

 experiments with, 438 ; nitrogen in, 

 439 ; phosphoric acid in, 439 ; pro- 

 fitable treatment of, 441 ; value of, 

 439 ; water in, 438. 



Shale -works, sulphate of ammonia, 

 from, 358. 



Shark's Bay guano, 309, 328. 



Sheep, excrements of, 280, 281 ; solid 

 excreta voided by, 280 ; urine voided 

 by, 280. 



Sheep-dung, alkalies in, 226 ; com- 

 position of, in dry state, 227 ; most 

 valuable excrement, 227 ; nitrogen 

 in, 226 ; phosphoric acid in, 226 ; 

 water in, 226. 



Sheep-manure, 251 ; amount produced 

 per day, 251 per year, 252 ; dry 

 matter in, 252 ; mineral matter in, 

 252 ; nitrogen in, 252. 



Sheep-urine, alkalies in, 230 ; com- 

 position of, in dry state, 231 ; most 

 valuable urine, 231 ; nitrogen in, 

 230 ; phosphoric acid in, 230 ; water 

 in, 230. 



Shoddy, 427; production of, 152, 

 425 ; nitrogen in, 152, 427. 



Sicily, bones from, 360. 



Sidney Island guano, phosphoric acid 

 in, 330. 



Siemens, Dr, experiments by, with 

 light on plants, 38. 



Silica, in ash of plants, 55 ; in Chincha 

 guano, 305 ; jelly, 169 ; necessary 

 for plant-growth, 55. 



Silicates, 102 ; absorbed by cereals, 

 494. 



Silicic acid fixed by soils, 58. 



Simon on humus in soil, 47. 



Slaked lime, 454. 



Slugs killed by lime, 461. 



Smut prevented by lime, 461. 



Soda, in ash of plants, 54 ; fixed by 

 soils, 58 ; necessary for plant- 

 growth, 55 ; nitrate of, 332 - 351 ; 

 in salinas. 335 : replaces potash, 

 466. 



Sodium chloride in Chincha Island 

 guano, 305. 



Sodium phosphate in concretionary 

 nodules, 328. 



Sodium sulphate in concretionary 

 nodules, 328. 



Soil, 65-108 ; absorptive power of, for 

 water, 67, 98 ; acids fixed by, 58- 

 60 ; action of lime on, 453 ; am- 

 monia absorbed by, 81 ; amount of 

 soluble plant - food in, 100 ; arti- 

 ficial, 54 ; barley, nitrates in, 158 ; 

 bases fixed by, 58-60 ; best suited 

 for nitrification, 192 ; biological 

 properties of, 92-96 ; capacity for 

 heat, 76-78 ; carbonic acid absorbed 

 by, 81 ; chemical composition of, 

 87 - 92, 101 - 107 ; colour of, 80 ; 

 cropped, nitrates in, 157 ; denitri- 

 fication in, 177 ; evaporation from, 

 71, 72 ; farmyard manure, action of, 

 on, 272 ; fertilising ingredients in, 

 87 ; fertility of, 65-108 ; fineness of, 

 69-70 ; gases in, 100 ; hygroscopic 

 power of, 75-76, 99; improved by 

 humus, 272 ; innueiice of farmyard 

 manure on, 475 ; on nitrification, 

 180 ; manures increase fertility of, 

 474 ; nitrates in, amount of, 128- 

 131 ; nitrifying organisms in, 179 ; 

 distribution of, 179 ; nitrogen ab- 

 sorbed by, 81, 82, 131 ; nitrogen 

 accumulates, 133 ; nitrogen in, 

 amount of, 120-128 ; nitrogen least 

 abundant of manurial ingredients 

 in, 270 ; nitrogen at various depths 

 in, 156 ; oxygen absorbed by, 81 ; 

 phosphoric acid in, 203 condition 

 of, in, 203 occurrence of, in, 203 ; 



