Proof, correction, 68 Proof-reading, 65, 68 Propagation, artificially, of fresh-water mussels, 114, 115 Protection, of birds, 124 of useful birds, 127 Protective coloration, 62 Protoplasm, influence of stimuli upon, 95 Protoplasmic respiration, 97 Psychic, criteria, 106 development of young domestic animals, 115 Psychology, comparative, 120 comparative, French work in, 107 English sparrow, 117 limits of comparative and genetic, 109 of ants, 120 Publication, preparation of papers for, 65, 68 Punctuation, 68, 69 Quahaug, growth, 108 life history, 108 Quantitative determination of fauna of lower Elbe, 138 Quantitative study, 61 animal life of sea-bottom, 63, 124, 136 of birds, 59, 60 of life of sea-bottom, 63, 124, 136 Quarnerian Gulf, animals associated in the, 135 Rabbits, 28 Raccoon, animal intelligence, 111 Raccoons, instincts, 110 intelligence, 110 sense, 110 visual discrimination, 110 Ranatra, death-feigning, 113 Random movements and phototaxis, 105 Rations, 62 Record keeping, 61 Recording notes, 64 Red-headed woodpecker, 117 Reef, ecological succession on an oyster, 112 Regeneration as functional adjustment, 98 Regulation, in behavior, 105 of insect oscillations by birds, 123 regeneration as functional, 98 Regulative action of nervous system, 98 Regulatory character of physico-chemical and physiological processes, 85 Relative equilibrium, 30, 31 Reproduction, fresh-water mussels, 114, 115 physiology, 100 Reptiles, Arizona, 148 associations of desert species, 148 collecting, 58 desert species, 148 food of desert species, 148 New Mexico, 148 Research methods, in plant ecology, 59, 88 Research, processes, 55 speculative method in, 55 Respiration, of an inland lake, 87 protoplasmic, 97 Response, bird migration as a, 109 to strain, 85 Responses, Isopods of ponds and streams, 106 study, 15 to chemical stimulations, 97 Rheotaxis in Isopoda, 106 Rheotropism in fish, 115 Rhynchophora, biologies, 76 food habits, 72 parasites, 76 Ring-dove, blond, 110 River entomology, Illinois, 75 River fauna, Danube delta, 145 lower Elbe, 138 River habitat, flooded delta, 145 River plankton, Illinois, 147 Rocky Mountain locust, enemies, 77 Rodentia, 107 Rose coral, feeding reactions, 109 Running water, effect on productivity of fish, 101 Salamanders, habits, 119 Salmon, internal parasites of Sebago, 129 _Salpa_ and evolution of life, 123 Salt-marsh Amphipod, habits and life history, 119 Salt-water fauna, 111. _See also_ Marine animals San Diego region, Chætognatha of, 115 Sand, ants, 149 areas of Illinois, biology, 146 prairies of Illinois, associational study, 139