INDEX 



/= figure, n = note. 



Adaptability, importance of, 6 

 Adaptation, 86 ; to special modes 

 of life, 77-79, 131 ; not univer- 

 sal in living things, 57 ; may 

 be too perfect, 77, 79 

 Aggregate differentiation, 64, 116 

 Albatross and wren, 86 

 Algae, mode of feeding, 122 

 American water-weed introduced 



into England, 71 

 Amoeba, pseudopods of, 1; repro- 

 duction in, 17 

 Amphibia, regeneration, 46 

 Animals,food-relation with plants, 



125, 130 

 Ants, 24, 36, 50 n, 65, 141, 142, 



158 

 Aphis, asexual reproduction in 



summer, 67 



Armadillo, produces quadruplets, 

 68, 70 



Bacteria, duration of life, 25 ; 

 lack of sexual process, 71 ; food- 

 relations, 128 ; lack of formed 

 nucleus, 59 



Bee, and hive, 9; communities of 

 bees as single individuals, 36, 

 65, 142 



Begonia, regeneration in, 19 



Benjamin Franklin's kite, 66 



Bergson, definition of individu- 

 ality, 1, 9 ; and continuance, 

 20 n ; indetermination and 

 brain-machinery, 6 



Blastodinium, 110 



Blastomere, definition, 69 ; re- 

 generation of, 149 



Bones, brittleness when old, 18 



Bougainvillea (Hydroid colonj'), 

 37/; 158 



Brain, 63, 140 ; and choice, 6 ; 

 and individuality, 29, 65, 83, 

 141; modifies method of indivi- 

 duation, 65, 140 



Budding, in animals, 38, 79, 80, 

 118 



Bud-sports, 81 



Butterfly, metamorphosis in, 75 ; 

 and flowers, 127 



Catenata, 107-114 



Caterpillar, metamorphosis, 77 ; 



" skin and squash," 78 

 Caulerpa, a single enlarged cell, 



89 

 Cells, 65, 68, 150; units of 



structure in higher animals, 



