INDEX 



Acacia, movement of, 120 



Acanthocephala, 24 



Acer platanoides, shoot of, 30 (fig. 8) 



Acr opera, number of seeds, 175 



Adder's-tongue fern, 183 



Adrenaline, 92 



Aepyornis, egg of, 183 



Aerobic organisms, 112 



Air, composition of, 23 



food of plants, 24, 29 



essential to human life. Ill 



in trout's air-bladder, 113 

 Aleurone-layer, Vitamin B in, 94, 95 

 Algae, 29, 61, 94, 151 



spores of, 162 



reproduction of, 164 

 Alimentary canal, 88, 89, 90, 91 



a means of breathing, 104 



absence of oxygen in, 113 

 Alligators, food of, 69 

 Alpine plants, vegetative reproduc- 

 tion of, 164 

 Alternation of generations, 167-9, 189 

 Alveoli, 111 

 Amaryllis, 54 

 Ambergris, value of, 76 

 Amino-acids, 29, 89 

 Ammonia, 21, 39, 40 

 Ammonium carbonate, 39 

 Amoeba, described, 9-13 



dissection of, 11-12 



distinguished from other organisms, 

 13 



killed by 98° R, 45 



and bacteria, 45, 59, 109 



movement of, 121, 123 



movement rate of, 122 



mode of reproduction, 161, 165 



immortal, 166 

 Amoebocytes, 121 



Amoeboid movement, mechanism of, 

 122 



movement, rate of, 122 



ova, 183 

 Amphibia, 105, 179, 180, 181 

 Amphioxus lanceolatus, 178 

 Anabolism, 58 

 Anaerobes, 35, 38, 112, 113, 114 



Annular sap vessels, 50 

 Ant-bear, food of, 74 

 Ant-eater, Australian, Echidna, 74, 

 109 



Tamandua, 76 

 Aniedon, see Sea-lilies 

 Antherozoids, 15, 116, 119, 166 



rhythmic beat of fiagella in, 134 

 Ants, speciahzed forms of, 154 

 Aphis, winter egg of, 188 

 Aphrodite (Sea-mouse), 108 

 Appetite, 96, 97 

 A pus, 107 

 Aragonite, 138 

 Area, 107 



Arcella, rise and fall of, 144 

 Armadillo, food of, 75 



armour of, 19 

 Arfhropoda, excretion by, 5, 17 



movement of, 126 



spermatozoa of, 184 

 Artichoke, Jerusalem, 163, 164 

 Artiodactyla, 11, 78, 79 

 Ascaris myslax, 113 



A. megalocephala, 113 

 Ascidians, 5, 26, 58, 169, 178 

 Ass, wild, food of, 78 

 Assimilation by protoplasm, 4 

 Aster, rhythmic occurrence of, 136 

 Aurora Borealis, 37 



Aves, generation of, 181 

 Axon of nerves, 121 

 Azotobacter, 38 



£abingtonia abomina 



BTLIS, 162 

 Bacillus, derivation of name, 27 



B. subtilis, 27 

 B. welchii, 113 

 B. botulinus, 113 



Bacteria, 26, 37 



contents of, in soil, 45 



in soil, 45 



rhythmic fluctuations in number, 



45, 142 

 food for protozoa, 59 

 immortal, 166 



