Lack of oxygen, resistance affected by carbohydrates, 99 Lake as a microcosm, 123, 131 Lake beach, habitat, 147 débris, Sarcophagidæ with relation to, 147 Lake fauna, associational study, 140 correlated with vegetation, 140 habitats, 140 Lake, fish associations of a, 147 Lake habitat, changes in, 87 fish, 147 Lake, respiration of an inland, 87 Lake shore, animal associations, 134 Lakes, gases dissolved in waters, 87 plankton investigations of Danish, 140 Land animal communities, controlled by vegetation, 90 vegetation and control, 124, 133 Land animals, ecological succession, 133 origin, 148 Land forms, changing, 86 Land habitats, changes, 86 Land tortoise of Florida, insect guests, 135 Larval habits of tiger beetles, 118 Larvæ, catalogue, 77 classification of Lepidopterous, 73 Coleopterous, table of families, 75 Donaciinæ, natural history, 109 Lepidopterous, 73, 78 saw-fly, 78 Lateral-line organs of fish, functions, 116 Law of response to strain, 85 Laws of change, orderly sequence, 79 Laws of regulation, in behavior, 105 in insect oscillations, 123 in metabolism, 85 Laws of sequence, in adjustment between animal and environment, 122 in animals, 92, 93 in environment, 79 within the animal, 92 Leech, behavior, 121 Lepidoptera, and temperature extremes, 99 field tables, 74 larvæ, 73, 78 larvæ, classification, 73 transformations of described, 73 _Leptinotarsa_, behavior, 119 habits, 119 instincts, 119 _Leptothorax Emersoni_ Wheeler, ethological observations, 120 Life and chemistry, 97 Life centers, geographic, 99 Life histories, aquatic Nematocerous Diptera, 75 fish, 112 insects, 73 insects and allied invertebrates, 70 insects, in Lintner’s New York State entomologist’s reports, 74 mammals, 118 Odonata, 76 physiological, 17 salamanders, 119 tiger beetles, 118 Life history, common clam, 114 humble-bee, 119 quahaug, 108 scientific ideas, 57 Life, maintenance, 97 nature, 97 origin, 97 Light, and behavior of organisms, 115 locomotor responses of animals to white, 107 reactions of Amphibians, 116 reactions of dragon-fly nymphs to, 118 reactions of Isopods to, 108 reactions of Planarians to, 105 white, locomotor responses of animals to, 107 Limiting factors, 98 Limpet, environmental studies, 101 Limulus, behavior of early stages, 105 Lists, local, 48 Literature, limitations and value, 82, 83, 84 Living matter, dynamics, 96 Lizards, behavior, 116 food, 129 Pennsylvania, 129 Lobster, behavior, 105, 113 natural history of the American, 113 Local lists, 48 Locomotion of starfish, direction, 110 Locomotor responses to white light, 107 Locust, Rocky Mountain, 77