Part 82

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