INDEX 



35T 



spiration, 14 1 ; on water in soil, 

 when plants wilt, 94 



Salfeld on soil inoculation, 211 



Salt,:Causing sterility, 282 ; marshes, 

 vegetation of, 324 



Salts, soluble in soils, 167 



Sampling of soils, 53 



Sand, origin of, 17, 37 ; velocity of 

 current required to carry, 37 



Sandy soils, 34, 296, 318 



Saturation of soils by water, 73 



Saussure on theory of nutrition, 199 



Schloesing on colloid clay, 39 ; on 

 mechanical analysis of soils, 56 



Schloesing and Muntz on nitrifica- 

 tion, 218 



Schloesing fils on fixation of nitrogen, 

 206 



Schneidewind ondenitiification,228; 

 on fixation of nitrogen, 212 



Schultz on green manuring, 210 



Sea, effect on climate, 156 



Sedentary soils, 7 



Selenite, 25, 329 



Senft on decomposition of felspar, 20. 



Serpentine, 23 



Sewage farms, crops on, 103 ; puri- 

 fication of, by soil, 228, 249 



Shingle, growth of vegetation on, 10 



Shrinkage of clay on drying, 38, 

 328 



Sibirtzef, 31 



Silica, 17 



Silt, 58 



Soil, alkali, 284, 316; analyses of 

 typical, Appendix I. ; description 

 of, 7, 30; drift, 8 ; gases, 13 ; 

 inoculation, 208 ; mulch, 115 ; of 

 transport, 8 ; relation to subsoil, 

 7, 28, 221 ; sedentary, 7 ; solu- 

 tion, 179 ; surveys, 333 ; tempera- 

 tures, 136 ; typical, 60, 169, 337 ; 

 worn-out, 29, 298 

 Soot, effect on temperature of soil, 

 145 ; effect on texture of soil, 293 

 Specific heat of soils, 146, 319 

 Spring on impermeability of clay, 



77 

 Spring cultivation, gain of water by, 



108 ; frosts, 152 

 Stahl on mycorhiza, 241 

 Steppe soils, 31 

 Sterility of soils, 280 



Stoklnsa on alinit, 198 



Stones, reputed growth on arable 



land, 12 ; retention of moisture 



by, 117 ; warming effect of, 149 

 Subsoil, description of, 7, 28, 221 ; 



as regulator of water supply, 1 10 ; 



packing, 120 

 Surface of soil particles, area of, 71, 



98 ; rise of salts to (he, 284 

 Surface tension, 77 ; cohesion due 



to, 91 ; variations in, 90 ; water 



lifted by, in, 118 

 Surveys, soil, 333 

 Symbiosis, 193, 241 



Talc, 23 



Tchernozem, 32 



Temperature, effect of colour on, 

 144 ; effect of exposure on. 148, 

 151; required for growth, 138, 

 140 ; weathering due to alterna- 

 tions of, 9 



Texture of soil, 36, 66, 275, 291 



Thanet sand, soils on, 274 



Tillage and soil water, 103 



Tilth, 108, 291 



Transpiration water, 101 



Tundra soils, 33 



Typical soils, chemical analysis of, 

 169 ; mechanical analysis of, 61 



Urea, conversion into ammonia, 

 196 



Valley frosts, 152 



Velocity of currents carrying sand 



grains, 37 

 Ville on fixation of nitrogen, 204 

 Vineyards, stones on surface of, 149 

 Virgin soils, nitrogen in, 216 

 Voelcker on absorption of manures 

 by soil, 248 ; on analysis of drain- 

 age waters, 259; on fixation of 

 nitrogen, 204; on " finger-and- 

 toe " in turnips, 244 



Wagner on denitrification, 228 

 Warington on determinations of 

 nitrates in soils, 168 ; on denitri- 

 fication, 227 ; on nitrification, 218 ; 

 on wetness of land in February, 

 98 



