346 



INDEX 



Grain and grass crops, manures 



for, 195, 287, 288 

 Grandeau's method, 111 

 Granite, 29, 30 

 Gravel, 32, 51 

 Green manures, 301 

 Greenland guano, 296 

 Ground lime, 119 

 Guano, application of, 298 

 artificial, 293 



,, composition of, 296 



,, imports of, 295 



,, mammal value of, 297 



,, nitrogenous, 295 



,, origin, 294 



,, Peruvian, 295 



,, phosphutic, 214, 295 

 Gypsum as manure, 199, 291 



,, ,, preservative, 322 



,, mineral, 20 



HEMATITE, 19 



Hair as manure, 251 

 Hay, composition of, 169 

 Heat, conduction of, 81 

 ,, capacity of soils for, 78 

 latent, 80 

 ,, production of, 82, 198 

 ,, radiation of, 80 

 ,, sources of, 74 

 ,, specific, 7s 

 Heavy manures, 203 

 Heavy soils, 35, 48 

 Heinrich's experiments, 62 

 Hellriegel on fixation of nitrogen, 



143 

 ,, ,, optimum amount of 



water, 62 



,, ,, transpiration, 73 

 Hendrick on basic slag, 231 

 ,, ,, seaweed, 303 



Highland Society's unit values, 



333 



Hilgard on floculation, 87 

 Hilgenstock on slag phosphates, 



229 



Hiltner's culture, 149, 150 

 Herring guano, 247 

 Hoof meal, 250 

 Hops, manure for, 242, 251 

 Hornblende, 21 

 Horn meal, 250 

 Horse dung, 306, 326 

 Hughes on composition of ferns, 



304 



Humates, 110, 316 

 Humic acid, 85, 87, 109 

 Hurnin, 109 

 Humous soils, 42 

 Humus, 108 



Hydrates, deliquescent, 59 

 Hydrochloric acid extract of soils, 



120 



Hydrogen in plants, 5 

 Hydrolysis, 154 

 Hygroscopy, 58 



ICELAND guano, 296 



Ichaboe guano, 296 



Igneous rocks, 24 



Imports of bones, 2.'>!) 

 ,, ,, guano, 295 

 ,, ,, nitrate of soda, 262 

 ,, ,, potash salts, 282 

 ,, ,, raw phosphates, 'JOS 



Impurities in air, 15 



Inoculation of soils, 146, 149 



Insoluble mineral residue of soils, 

 120 



Internal surface of soils, 54, 108 



Interspace in soils, 51, 89 



Iodine in Chili- saltpetre, 261 



