INDEX 



(References in heavy type refer to illustrations) 



ABUNDANCE OF LIFE, 7-15 

 Adaptations of birds, 57-64 



of fish, 43-8 



of mammals, 48-57 

 ^Esop (prawn), 169-77 

 Agelena, web of, 95, 96 

 Air bladder, 118-9 

 Air tubes, 250 



Ammophila (sand- wasp), 271-4 

 Andrena (solitary bee), 284, 



285 

 Anemones, food of, 79 



pigments of, 106 



respiration of, 105 

 Anguis (slow- worm), 18 

 Animalcules (Protozoa), 19, 33, 



66, 105 

 Animals, fixed, 66 



food of, 65-98 



life histories of, 217-300 



movement of, 26 



respiration of, 99-126 



senses of, 127 

 Ants, nests of, 294-300 



nursing habits of, 299 



swarming of, 294-6, 197-8 



workers, 297-8 

 Aphides (green-fly), 12 

 Arachnids, food of, 92-7 

 Arctic bees, 291 

 Arctic colouring, 179-80 

 Avion (slug), 4 

 Avebury, Lord, 71, 98, 296 



BARNACLES, food of, 66, 78 



Bats, 41, 53, 56-7 



Bee, burrowing, 282-284 



evolution of, 284-94 



hive (honey), 293-4 



leaf-cutter, 278 



solitary, 277-85 

 Beetles, 238 



burying, 76 



tiger, 89 

 Birds, flight of, 57-61 



food of, 76-7, 85-6 

 Blood, 108, no 



pigments, 156-9 



relationship, 17 

 Blood-sucking flies.. 248-52, 257- 



60, 262-3 



Bombus (bumble-bee), 286-91 

 Branchipus (brine-shrimp), 109 

 Breathing. (See ' Respiration ') 

 Butterflies, cabbage-white, 243 



emperor, 90 



leaf, 185 



orange-tip, 179 



CADDIS-FLIES, 235-8 



worms, 236 



Campodea (primitive insect), 22 '. 

 Carnivores, origin of, 78, 88 

 Caterpillars, 241-5 

 Centipedes, 39 

 Changefulness, 99 

 Chironomus (harlequin fly), 252 



