INDEX 



307 



Fen land, potatoes from the black 



soils of, 2 ; reclamation of, 258. 

 Ferrous carbonate in soils, 145. 

 Fertility, 233. 

 Film of water surrounding soil 



particles, 73. 

 "Finger-and-toe," 204, 208, 243, 



276. 

 Fixation of nitrogen, 1 74. 

 Flint, 18. 



Flocculation of clay, 38, 40, 253. 

 Flow of water through soils, 70. 

 Frank on mycorhiza, 205. 

 Frosts in valleys, 135 ; killing effect 



of, 124. 

 Fruit trees in grass land, ill. 

 Fuller's earth, 37. 

 Fungi in the soil, 168, 204. 



Gayon and Dupetit on denitrifica- 



tion, 198. 

 Germination, temperatures of, 124. 

 Glacial drift, 1 5. 

 Glauconite, 25. 

 Granite, weathering of, 19. 

 Gravel, 15. 



Green manuring, 185. 

 Greenstone, weathering of, 21. 

 Grey wethers, 1 7. 

 Gypsum, 24. 



Halophytes, 280. 



Hanamann on weathering of basalt, 



22. 

 Heat received by the soil, 120, 126 ; 



required for evaporation, 130. 

 Heavy soils, 64. 

 Heinrich on hygroscopic moisture, 



85- 

 Hellriegel on fixation of nitrogen, 

 176, 179 ; on optimum proportion 

 of water for growth, 69 ; on water 

 transpired by crops, 89. 



Hilgard on alkali soils, 246 ; on dis- 

 tillation of water from subsoil, 88 ; 

 on mechanical analysis of soils, 

 50 ; on method for determination 

 of water capacity, 67. 



Hilgard and Jaffa on nitrogen in 

 humus, 46. 



Hiltner, cultivation of nodule organ- 

 isms, 183. 



Hoeing, 102. 



Hornblende, 21. 



Humic acid, 44. 



Humus, 24, 27, 42, 118, 168, 171, 

 174, 243. 



Humus, soluble, 44, 165. 



Hygroscopic moisture, 84. 



Ignition, loss on, 143. 

 Inoculation of soil, 183. 

 Interpretation of soil analysis, 151, 



165. 

 Irrigation, 246. 

 Iron bacteria, 203. 

 Iron pan in soils, 24, 275, 285. 

 Iron pyrites, 26 ; causing sterility, 



243. 



Kaolinite, 19, 34, 36. 



King on area of surface of soil 

 particles, 66 ; on bare fallows, 

 113 ; on effect of cultivation on 

 water content of soil, 96, 101, 103; 

 on effect of slope on temperature 

 of soil, 133 ; on flow of water 

 through sand, 70 ; on nitrates in 

 soil, 195 ; on percolation, 76 ; on 

 transpiration water, 89 ; on water 

 in soils too dry for growth, 85. 



Kossowitsch on fixation of nitrogen, 

 186. 



Kriiger and Schneidewind, 186, 200. 



Laking, 213. 



Langley on solar radiation, 126. 



