INDEX 



129 



Shrubs, 72 



Silt, 13, 41, 72, 74, 88, 89, 96-7 



Slavery, 35, 41, 42 



Stime mold, 48, 60 



Society, 47 



Soil, 2, 5, 6, 7, 52, 53, 55, 100; amend- 

 ments, 21; and animals, 80; ani. 

 mals in, 16; carbon dioxide, 16; 

 changes in, 61 ; chemurgic needs, 

 46; climate, 77; conserving, 14, 

 46 ; cultivation, 61 ; dry, 70 ; ero- 

 sion, 38, 85; fertility, 20, 23, 55, 

 66; formation, 20, 39, 51, 54, 58, 

 59, 60, 69, 88; of Great Plains, 20; 

 and health, 31-2; loam, 15, 74, 84; 

 minerals, 21, 26, 31, 55; nitrates, 

 16; potassium, 17; productivity, 

 21, 106; rain effects, 84; red clay, 

 21; in Southeast, 21; structure, 

 20, 84; and vitamins, 17, 18; wet, 

 70. 



Solar, 4, 5, 18 



Southern states, 20, 24, 36, 37, 45, 46 



Soybeans, 17, 45 



Species, new, 50-1 ; effect on environ- 

 ment, 51 



Spectroscope, 4 



Spermatophytes, 55 



Spores, 54, 62, 75, 76 



Sports, 50 



Springs, 89, 92, 93 



Starch, 14 



Streams, 3, 54, 88; flow, 93 



Strip cropping, 87; illus., 43 



Strip mining, 75 



Stems, 48 



Subsidence, 74 



Succession, 72, 74, 75, 77, 81, 84; illus., 

 78-9; secondary, 76 



Succulence, 20, 22, 23 



Sugar, 14, 15, 48 



Sulphur, 16, 28 



Sumac, 77, 78, 80 



Sun, 1, 4, 5, 6, 25, 49, 52, 70; power, 

 13, 14, 16, 83 



Surpluses, 36, 40 46 



Survival, 50, 51, 61, 66, 70, 87 



Sustained, production, 36, 43; yield, 

 104 



Syria, 41 



Teachers, 25 



Teeth, 24; and diet, 31 



Temperature, 60 



Tensions, of unbalance, 84, 87 



Termites, 17 



Terraces, in Lebanon, 11 ; in Rhine 



Valley, 71 



Thallophytes, 53, 54 

 Thinking, normal and abnormal, 3 

 Tigris, 35, 41 

 Tillage, 105 



Timberland, 10, (see forests) 

 Tobacco, effect on soil, 20 



Topography, 51, 76; cause of succes- 

 sion, 72 



Topsoil, 3, 5, 9, 18, 57, 59, 74, 8; 

 illus., 39; loss illus., 39 



Trees, 46, 61, 62, 72, 88; in succession, 

 77, 79, 80 



Tree ferns, 54 



Tropics, fertility of, 21; leaching in, 

 21 ; proteins in, 21 



Trout, 88 



Unbalance, 84, 87, 88, 89, 92 



United States, 6, 10, 17, 24, 25, 66, 82, 



107 ; erosion map of, 38 

 Unity, 12 

 Universe, 48 

 Uplift, geologic, 74 

 Uranium lead, 49 

 U. S. Dept. of Agriculture, 40, 96 

 U. S. Forest Service, 42, 97 



Variations, plant, 50-1 



Vegetation, 39, 47, 68, 69, 72, 75, 90, 

 92, 104; needed for chemurgy, 46; 

 and climate, 69; destroyed, 37; 

 stream bank, 88 ; woody, 17 



Vitamins, 17, 34, 52; C, 70; deficien- 

 cies, 25; A, in foxes, 32; loss of, 

 18; pills, 18 



Volcano, 58, 74 



Walnut, 80 



War, 9, 10, 64, 103 



Waste, wood, 46 



Water, 1, 2, 5, 11, 15, 16, 17, 49, 52, 

 54, 55, 58, 69, 71, 89; artesian, 

 93; cycle, 1, 7, 13; ground, 74; 

 hauling, illus., 92 ; indicators of, 

 81 ; muddy, 89 ; power, 1, 14 ; 

 table, 93 



Watercloset, 6 



Watershed, 93, 96 



Waves, 52 



Weather, 5, 58, 61 



Weathering, 7, 20 



Weeds, 52, 69; sea, 53 



Wills, 92; artesian, 93 



Western Europe, 71, 94; agriculture, 

 66 



Wheat, 20; analysis, 26 



Wildlife, 39, 64, 93, 106; decline of, 

 98, 99 ; distribution, 23 ; and laws, 

 106; population, 106; and soil fer- 

 tility, 26, 32, 34, 77 



Wind, 7, 50, 54, 74 



Wolf, 106 



Woodcock, 106 



Wood, needs, 45; products, 40, 41; 

 waste, 46 



Woodiness, of plants, 20 ff. 



Woodland management, 44 



Yield, sustained, 104 

 Yacatan, 10 



Zinc, 10, 28 



