160 



INDEX 



Entomophilous flora, ecological re- 

 lations to anthophilous insect 

 fauna, 142 

 Environment, 5 



and the animal, adjustment be- 

 tween, 122 



describing, 45 



development, 45, 46 



effect on development of mol- 

 lusks, 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 

 Ephemeridae, 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, vegeta- 

 tional 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 zoology, 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 



