126 



MAN ON THE LANDSCAPE 



Darwin, 50 



Death, 69, 70 



Decay, 53 



Deer, 106 



Deficiencies, vitamin, 18 



Dept. of Agric., U. S., 37 



Deposition, 72 



Desert, 52, 69, 71, 72 



De Vries, 50 



Dewberry, 77, 78 



Diet, 7, 9, 17; and beri-beri, 17; and 



bones, 31, 32; changes needed, 40; 



family, U. S., 40; and teeth, 31, 32 

 Disease, 53, 54 ; and pollution, 95 

 Dogwood, 79 

 Drainage, 93, 95 

 Drought, 74 

 Ducks, 102 

 Dust Bowl, 37 



Earthquake, 58, 74 



Earthworm, 16, 80, 105 



Ecological 

 disasters, 92 ; 

 factors, 69, 70, 81, 90 



Ecologists, 75 



Ecology, 68, 69; climate and, 69; ani- 

 mal, 80 



Economics, and erosion, 89 



Education, 12, 44, 58, 68, 92 



Egyptians, 41 



Electricity, 5 



Electrons, 4, 5 



Elements, 1, 2, 4, 5, 6, 10, 48 



Elk, 75 



Energy, 1, 2, 5, 10, 15, 49, 52, 84, 87, 

 106 ; atomic, 14 ; fats, 14 ; kinetic, 

 83 ; stored 13, 14, 16, 91 



Environment, 1, 3, 50, 51, 53, 54, 58, 

 72, 75, 76, 89, 91; abnormal, 1; 

 changes affect plants, 56, 71; evo- 

 lution of, 57-67, 80; improvement 

 of, 12, 104-6; indicators, 81; and 

 man, 64, 71, 104; management of, 

 19; and man, 64, 71, 104; sta- 

 bilized, 81, 101 



Erosion, 3, 7, 36, 52, 53, 77, 83, 87, 88, 

 89, 103, 107; and animals, 106; 

 and civilization, 41, 42; extent, 37, 

 93; map of, U. S., 38; prevention, 

 85 ; process, 84 ; sheet, illus., 39 ; 

 types, 74; water, illus., 7; 8, 9, 72, 

 85 ; 86, 99 ; wind, 74 



Englena, 48 



Euphrates, 35, 41 



Europe, 35, 36, 42, 71; agriculture, 66; 

 forestry, 44 



Evaporation, 74 



Evolution, 72, 81 



of environment, 57-67; of landscape, 

 54; of plants, 48-56 



Exploitation, 35, 36, 44 



Extinction, 51, 52, 102 



Farm, 3, 72, 75 



conservation on, 71; impoverished, 10 



Fats, 14 



Fecundity, and soil, 32 



Ferns, 54-5, 61 



Fertility, 6, 18, 66, 81, 101, 106; and 

 proteins, 16; rebuilt, 77; of water, 

 54 



Fertilizer, 3, 4, 87 



effect on animals, 22; effect on 

 clover, 27 



Fire, 15, 62, 74, 75, 90, 101 

 effect on soil, 88 ; ground, 75 



Fish, 15, 52, 83, 88, 89, 105 ; and pollu- 

 tion, illus., 96 



Flood, 62, 74, 87, 101 



cost, 93 ; increases, 89, 93 



Flour, 18 



Food, 6, 7, 14, 15, 39, 82, 88, 98 

 exports, 40; preparation, 25; preser- 

 vation, 54; processing losses, 18; 

 and teeth, 31 ; U. S. needs, 40 



Forests, 3, 12, 13, 23, 36, 37, 42, 52, 

 61, 63, 69, 70, 72, 81, 107 

 Assyrian, 41; coniferous, 17; cut 

 over, 44; destruction, 40, 42, 43, 

 45, 75, 96, illus., 98; of Europe. 

 42 ; exploitation, 44 ; fire results, 

 illus., 65, 75, 88, 89; management. 

 44, 45; production, 45; products. 

 41, 45 ; virgin, illus., 63 



Forester, 44, 45 



Forestry, 44, 45, 82 



Forest Service, U. S., 42 



Fossils, 50, 51 



Fox, 88; nutrition of, 32 



Freemen, 36 



Fuel, mineral, 14 



Fungi, 16, 53, 54, 59, 60 



Fur farming, 32 



Game, 83, 89, 98 



Gas, natural, 13 



Gasoline, 13, 14 



Geologist, 58 



Germans, Pennsylvania, 71 



Germany, 64, 103 



Glaciers, 50, 54, 74 



Goats, 41 



Grass, 26, 81, 91, 99 



nutrional value, 77 ; poverty, 77 

 Grasslands, 15, 23, 52, 67 

 Grazing, 22, 90, 91 

 Gravity, erosion, 74 

 Great Lakes, 50 

 Great Plains, 24 



drought, 74, 101; Dust Bowl, 37; 



health on, 20; plowing of, 37; soil 



of, 20 



Greece, 10, 35, 42 

 Growth, 49; stimulators, 17 

 Gully, 7, 36, 66, 74, 88; illustrations: 



Frontispiece, 8, 67, 86, 89, 91, 98. 



99 



