Part 56

Accidents, 62

Acridiidæ, courtship, 117 habitats, 148

Adaptation, adjustive, 10 and evolution, 97 as a process, 9 as a product, 9 theory, 136

Adirondacks, aquatic insects, 75

Adjustment of organisms, process of, 122

Adjustment, process of, 5, 30, 31, 33, 122

Age of lower organisms, 97

Aggregate, 8 as agent or entity, 4 ecology, 4, 23, 24, 133

Aggregations, 27, 145 dynamic relations of, 130

Agricultural reports of the U. S. patent office, index, 72

Air, vegetational control of relative evaporating power of, 90 vegetational control of relative humidity, 90

Alluvial flats, vegetational invasion, 89

Alps, soil fauna, 144

Alternating generations of oak gall flies, 143

Ambrosia beetles, 127

American lobster, natural history, 113

Amia calva, natural history, 117

Amphibians, associations of desert species, 148 collecting, 58 desert species, 148 food of desert species, 148 reactions to light, 116

Amphioxus, behavior, 116 sensory reactions, 116

Amphipods, distribution of fresh-water, 111 food of fresh-water, 111 reproductive capacity of fresh-water, 111 salt-marsh, habits and life history, 119

Amphithoe longimana Smith, habits and natural history, 113

Animal and plant associations of arid region, 148, 149

Animal associations, and marine vegetation, 89 and vegetation, 90 of a lake shore, 134

Animal behavior, 107, 121 as a process, 102 Bohn’s studies in, 107 limits of study, 103

Animal communities, 133, 134

Animal ecology, of Chicago region, 134 of Cold Spring sand spit, 136 of seashore, 63, 64 of shore, 139

Animal galls, 143

Animal geography, physiological, 101