Logs, fauna under, 144 Louisiana, marine food mollusks, 114 Lower organisms, age, 97 behavior, 96, 105, 107 conjugation, 97 death, 97 Lycosidæ, ecology, 125 habitats, 125 _Lymnæa Columella_ Say, effects of environment on growth, 100 Lymnæas, ecology, 108 Lymnæidæ, ecology, 108 _Lymnæus Eleodes_ Say, behavior, 120 Maize, _see_ Indian Corn Maladjustments of plants and ants, 126 Mammal associations, 145 Mammal successions, 145 Mammals, bibliography of North American, 107 collecting, 58 habits, 118 habits of North American, 107 Isle Royale, ecological succession, 145 life histories, 118 methods of study, 39 Man, influence upon insects, 135 Mangroves, Florida, 89 Manual of style, 68 Manuscript arrangement, 69 Marine animals, and vegetation, 89 associational study, 136 associations, 135 collecting, 57 distribution, 139 food of, in Kiel Bay, 129 habitat study, 136 Marine food mollusks of Louisiana, 114 Marine habitats of animals, 135 Marine invertebrates, 146 Marine life, quantitative study, 124 Marine vegetation and animal associations, 89 Marsh habitats, mollusks, 137 Maryland farm, birds of a, 125 Massachusetts shell-fisheries, 108 Mating instincts, of walking-stick, 119 Mating period of spiders, habits, 115 Mayfield Cave fauna, 143 Mayfly nymphs, keys, 75, 76 Meadow ants, 149 Media, changes in, 88 Medical zoölogy, bibliography, 129 Metabolism, 92, 93 fish, 100 in the sea, 87 Method, comparative, limitations, 56 genetic, 56 historical, 56 scientific, 55, 56, 57 Methods, biometric, 63 of homing pigeons, 113 of investigation, energy, agent and process, 56 of microscopic anatomy, 62 of study, 14, 39 of studying birds, fish, mammals, 39 Microcosm, 4 lake as a, 123, 131 Microscopic anatomy, methods, 62 Migration, influence on animal parasites, 130 of birds, 109 of birds, as a response, 109, 110 Migratory plant formations, 88 Mimicry, 42 of insects of South Africa, 128 Missouri, insects, 77 insects, index of reports on, 77 Modifiability of behavior of _Hydroides Dianthus_ V., 106 Modifications, of behavior, 93 of behavior by experience, 106 Molluscan associations, local, 137 Molluscan succession, associational study, 137 Mollusk fisheries of Massachusetts, 108 Mollusks, associations, 138 collecting, 58 ecology, 147 effect of environment, 100 habitats, 138, 145, 147 habitats in fresh water, 147 of Louisiana, marine food, 114 of Skokie Marsh area, ecology, 137 Mongoose, 28 Morphology, experimental, 95 Mosquitoes, Dragonflies _vs._, 72 Moth, Yucca, 142 Moths, drinking habits, 119 reactions, 106 Mourning-cloak butterfly, phototropism, 116 Movements, physiology, 107