INDEX 



349 



Grey wethers, 18 

 Gypsum, 25 



Halophytes, 324 



Hanamann on weathering of basalt, 



22 

 Heat received by the soil, 135, 143 ; 



required for evaporation, 147 

 Heaths, reclamation of, 298 

 Heating soils, effect of, 233 

 Heavy soils, 65 

 Heinrich on hygroscopic moisture, 



95 



Hellriegel on fixation of nitrogen, 



201, 205 ; on optimum proportion 

 of water for growth, 75 ; on water 

 transpired by crops, 1 00 



Hilgard on alkali soils, 285 ; on dis- 

 tillation of water from subsoil, 98 ; 

 on mechanical analysis of soils, 

 56 ; on method for determination 

 of water capacity, 73 



Hilgard and Jaffa on nitrogen in 

 humus, 51 



Hiltner, cultivation of nodule organ- 

 isms, 208 



Hoeing, 115 



Hornblende, 21 



Humic acid, 49 



Humus, 28, 47, 131, 187, 194, 198, 

 243,298 



Humus, soluble, 49, 187 



Hygroscopic moisture, 93 



Hutchinson, lime in soil, 164, 171 ; 

 protozoa, 232 



Ignition, loss on, 163 

 Inoculation of soil, 208 

 Interpretation of soil analysis, 59, 



171, 188 

 Irrigation, 285 

 Iron bacteria, 239 

 Mron pan in soils, 25, 319, 329 

 Iron pyrites, 27 ; causing sterility, 



281 



KAOLINITE, 19, 38, 40 



King on area of surface of soil 

 particles, 72 ; on bare fallows, 

 126 ; on effect of cultivation on 

 water content of soil, 109, 1 14, 

 119; on effect of slope on tem- 



perature of soil, 151 ; on flow of 

 water through sand, 76 ; on 

 nitrates in soil, 222 ; on percola- 

 tion, 82 ; on transpiration water, 

 100 ; on water in soils too dry for 

 growth, 95 



Kossowitsch on fixation of nitrogen, 

 212 



Krliger and Schneidewind, 212, 228 



LANGLEY on solar radiation, 143 



Late soils, 1 54 



Laterite, 31 



Laurent on fixation of nitrogen, 206 



Lawes and Gilbert on fixation of 

 nitrogen, 201 ; on ratio of carbon 

 to nitrogen in soils, 51 ; on tran- 

 spiration water, IOO (see also 

 Rothamsted) 



Leguminous plants, fixation of 

 nitrogen by, 205 ; green manuring 

 with, 210 



Liebig, mineral theory, 200 



Light soils, 65, 70 



Lime, effect on temperature of soil, 

 146 ; composition of, 313 ; floccu- 

 lation of clay by, 45 ; for " finger- 

 and-toe," 244 ; in drainage waters, 

 259 ; removal from soil by use 

 of ammonium salts, 252, 259; 

 amount required by soil, 171 



Liming, 45, 245, 304 



Limonite, 25 



Loams, 35, 322 



Loess deposits, 10, 31 



Lois-Weedon husbandry, 127, 225 



Lucerne requiring inoculation, 209 



Lysimeter, 85 



MAGNESIA in drainage waters, 261 ; 

 in soils, 167, 282, 329 



Manures, absorption of, by soil, 247 ; 

 effect on texture of soil, 292 ; 

 original signification of, 174; re- 

 covery of, in crop, 185, 230 ; time 

 of application of, 266 



Marcasite, 27 



Mm ling, 296 



Marls, 35- 2 97 



Mechanical analysis of soil, 35, 55 



Mica, 21 



Mineral theory, Liebig's, 200 



