3o8 



INDEX 



Late soils, 135. 



Laurent on fixation of nitrogen, 

 181. 



Lawes and Gilbert on fixation of 

 nitrogen, 176 ; on ratio of carbon 

 to nitrogen in soils, 46 ; on tran- 

 spiration water, 89. (See also 

 Rothamsted.) 



Leguminous plants, fixation of 

 nitrogen by, 180 ; green manur- 

 ing with, 185. 



Liebig, mineral theory, 175. 



Light soils, 64. 



Lime, effect on temperature of soil, 

 127; composition of, 268 ; floccu- 

 lation of clay by, 40; for " finger- 

 and-toe," 209 ; in drainage waters, 

 223 ; removal from soil by use of 

 ammonium salts, 216, 224. 



Liming, 41, 209, 261. 



Limonite, 24. 



Loams, 31, 278. 



Loess deposits, 10. 



Lois-Weedon husbandry, 114. 



Lucerne requiring inoculation, 184. 



Lysimeter, 78. 



Molecular forces, 71. 

 Molisch on iron bacteria, 203. 

 Moor-band pan, 25. 

 Moore, cultivation of nodule organ- 

 isms, 183. 

 Mould, 171. 

 Mulches, 102, 246. 

 Muller on nitrification, 191. 

 Mycorhiza, 205, 277. 



Natrolite, 26. 



Nile water, 256. 



Nitragin, 183. 



Nitrates, determination of, 147; for- 

 mation of, 112, 194; in drainage 

 waters, 226 ; in soil, effect of 

 cultivation on, 195 ; produced by 

 bare fallow, 112, 196. 



Nitrification, 191. 



Nitrogen, determination of, 144 ; 

 fixation of, 174 ; proportion re- 

 covered in crop, 199, 202. 



Nobbe on nitragin, 183. 



Nodules on leguminous plants, 180. 



Magnesia in drainage waters, 225 ; 

 in soils, 146, 243, 285. 



Manures, absorption of, by soil, 21 1; 

 effect on texture of soil, 251; 

 original signification of, 154; re- 

 covery of, in crop, 164 ; time of 

 application of, 229. 



Marcasite, 26. 



Marling, 256. 



Marls, 31, 257. 



Mechanical analysis of soil, 32, 50. 



Mica, 20. 



Mineral theory, Liebig's, 175. 



Minerals, composition of rock-form- 

 ing, 16. 



Mitscherlich on benetzungs-warme, 

 88. 



Oemler on specific heat of soil, 

 129. 



Olivine, 22. 



Optimum proportion ot water in 

 soils, for growth, 69 ; tempera- 

 tures for growth, 123. 



Orchids, germination of, 208. 



Osborne on mechanical analysis of 

 soils, 50. 



Osmosis, entry of plant food by, 

 157. 



Packing of soil particles, 6r. 

 Pan, iron, in soils, 24, 275, 285. 

 Paring and burning, 259. 

 Parkes on temperatures of drained 

 and undrained land, 132. 



