Part 67

Environment, 5 and the animal, adjustment between, 122 describing, 45 development, 45, 46 effect on development of mollusks, 100 effect on insects, 96, 97 effect on limpet, 101 effect on snails, 100 fish, 64, 118 fitness, 85 great changes, 26 gross evolution, 86 making to order, 33 natural, and behavior, 110 natural or normal, 34 orderly sequence, 79 original conditions, 25, 26 parasites, 126 sequence of changes, 104

Epeira, habits, instincts, 117

Ephemeridæ, 76

Epinomia triangulifera Vachal, bee community, 139

Equilibrium, relative, 30, 31

Ethological maladjustments of ants, 126

Ethological observations on an ant, 120

Ethological study, comparative, of spiders, 138

Ethology, 18, 19, 21, 59 and mutation theory, 22 ants, comparative, 149 diagram of subdivisions, 133 history, 133 subdivisions, in diagrams, 133

Europe, cave fauna, 144 plant galls, 143

Evaporating power of air, vegetational control of, relative, 90

Evaporation, and plant societies, 90 and soil moisture, 62 open and wooded areas, 91 plant societies and, 64

Evolution, 9 and adaptation, 97 as a process, 10 ecological features of, 21 experimental, 96 mutual aid a factor of, 133 of life and Salpa, 123 organic, and baseleveling, 86

Existence, natural conditions, 96 struggle for, 2, 122, 123

Experiment Station Record, 76

Experimental evolution, 96

Experimental morphology, 95

Experimental study, limits, 103

Experimental zoölogy, 96

Explanatory or developmental method, 14, 15

Exploration, scientific, 63

External relations, 1

Extremes, influence, 98

Eyes, frog, 110 insects, 110 slug, 110 snail, 110 sow bug, 110 various types and image-forming powers, 110 worms, 110

Factor of evolution, mutual aid a, 133

Factors, influence of the slowest, 98 limiting, 98

Family, 132

Fauna, and flora of the sea bottom, 64 cave, 101, 112, 143, 144, 145 cryptozoic of Australasia, 144 Germany, classified by habitat, 134 grave, 144 Indiana caves, 144 Mayfield’s Cave, 143 of brackish waters of Lower Elbe, 138 of Kiel Bay, 138 pond, 148 quantitative determination in brackish waters, 137 salt water, 111