572 



INDEX. 



Ferghana, alkali lands in 441 



Ferric hydrate, effects of IOQ 



functions of, in soils. 285 



high absorptive power of 277 



in Hawaiian soils ; table ... 356 



more diffused in humid than in arid soils 392 



Ferric phosphate, unavailability of 356 



Ferroso-ferric hydrate and oxid 18, 45 



Ferrous oxid 18 



Ferruginous lands, injury from swamping of 233 



Fertilizers, mineral 63 



waste of, by leaching 269 



Flocculation and floccules 91 



Flocculated structure ; cements maintaining no, in 



Flood-plains of rivers 14, 15 



Fool's gold 75 



Force exerted by roots 19 



Forecasts, general, of soil quality in forest lands 507 



of soil values, popular 313 



Forest trees, forms of 499 to 502 



of Atlantic states on alkali lands 481 



Form and development of trees, differences in 498 



Forms of leaves, variation in 502 



black-jack oak 499, 501 



post oak 499, 500 



trees, deciduous, in arid region 516 



willow, scarlet, black and Spanish oaks 502 



Freezing water, effects of 3 



Frost, effect of soils , 1 18 



Fruiting, favored by lime in soils 503 



Fungi and molds, action of 123 



functions in humus-formation 1 57 



G. 



Gases, absorption of, by soils 272, 275 



partial pressure of 276 



Germination of seeds 309 



Glacier flour, fineness and fertility of 5 



physical analysis of 5 



Glaciers, grinding and abrasion by ; figure 3 



Glauber's salt 77 



Glauconite, in calcareous sandstones 56 



Gneiss soils 51 



Gobi desert, migration of lakes 9 



Going-back of orchards 182 



Grain-sizes, effect on percolation ; table 224 



influence on soil texture 100 



