Food, beetles, 126 birds, 126, 128, 130 butterflies, 77 Coleoptera, 77 Echinoderms, 126 fish, 123 insects, 128 lizards, 129 nestling birds, 128 oysters, 112 predaceous beetles, 130 serpents, 129 snails, 125 Turbellarian, 127 woodpeckers, 126 Food habits, back beetles, 76 Cerambycidæ, 72 Chrysomelidæ, 72 Coleoptera, 77 grosbeaks, 128 larval Acalyptrate Muscidæ, 78 longicorn beetles, 77 Rhynchophora, 72 snout beetles, 76 Food of animals, in Kiel Bay, 129 of sea-bottom, 63, 136 Food plants, of Coleoptera, 77 of forest insects, 76 Food relations, Carabidæ, 127 cave animals, 144 Coccinellidæ, 127 Forest influences, 90 Forest insects, classified by food plants, 76 life histories, 74 literature, 74 Forest invasion on alluvial flats, 89 Forest types, determining, 89 Foresters, nature’s, 124 Forestry, 58 Forests, insect depredations in, 127 Form regulation, 97 Formation, 60 French work in comparative psychology, 107 Fresh-water Amphipods, 111 Fresh-water animals and plants, biological relations, 130 Fresh-water biology, keys to organisms, 78 Fresh-water biology, technique, 62 Fresh-water fish, food relations, 123 Fresh-water habitats, changes, 86 Fresh-water mollusks, habitats, 147 Fresh-water mussels, pearly, 119 Fresh-water Planarians, reactions, 116 Fresh-water plants and animals, biological relations, 130 Fruiting of blue flag, 142 _Fulgur_ eating oysters, mussels, and clams, 110 Function, of lateral-line organs of fish, 116 of mucus of shell-fish, 114 Fungi, and ants, 128 and bark beetles, 127 Galls, animals in relation to plant, 141 insect, 143 on European plants, 143 Gases, dissolved in water, biological significance, 87 reaction of fish to atmospheric, 118 General physiology, 95 General principles, value of, 41 Genetic classification, 56 Genetic method, 15 Genetic psychology, limits, 109 Genetic relation of types of action, 106 Genetic standpoint, 91, 101 Genetic studies, criteria in, 56 Geographic life centers, 99 Geologic processes, 86 Geological investigation, relation to biology, 22 Geology and ecology, 22 Glade, ants, 149 associations of ants, 149 Glover, Townend, entomological work, 73 Governmental publications, catalogues, 65 Grackles, 109 Grasshoppers, short-horned, associational groupings, 148 short-horned, habitats, 148 Grass-wrack, ecology of, in Danish waters, 89 Grave, fauna of the, 144 Green cells of _Convoluta roscoffensis_, bionomics, 127 Grosbeaks, food habits, 128 Gross environment, evolution, 86 Growth, 92, 93, 97 affected by environment, 100 influence of stimuli upon, 95 quahaug, 108 soft clam, 114 _Venus mercenaria_, 114