INDEX 



(Pages on which figures occur are indicated by heavy type.) 



Abalone, 159 



Abdomen, 74, 173, 176, 177, 

 180, 181, 182, 183 



Absorption, 58, 64 



Acerata, 181 



Activity, 1, 2, 9, 46, 100, 131 



Air, 15, 19, 25, 29, 32, 33, 34, 

 38, 40, 41 



Air cells, 34 



Air passages, 34 



Air pressure, 21 



Alcohol, 54, 84, 118, 119 



Alimentary canal (see Diges- 

 tive tract) 



Alternation of generations, 145, 

 146, 190 



Ameba, 11, 30, 78, 99, 124, 128, 

 131 



Ameboid motion, 141 



Amphibia, 188 



Anal spot. 130 



Analysis, 53 



Anatomy, 1, 2, 3 



Angle worm (see Earthworm) 



Animals, 1, 2, 9, 27, 53, 125 



Antennae, 176, 178, 181, 182, 

 183 



Antennules, 178 



Ant lion, 184 



Ants, 184 



Anus, 48, 49, 50 



Aorta, 72 



Aortic arch, 166 



Appendages, 173, 176, 178, 

 180, 181, 182, 187 



Aquatic animals, 31, 33, 169 



Arm, 105, 106, 107, 108, 109 



Arteries, 71, 74 



Arthropoda, 173-184 



Assimilation, 45-66; of proto- 

 zoa, 10, 11, 129, 130; of coe- 



lenterata, 139-141; of echi- 

 nodermata, 151, 152; of 

 vermes, 163-165; of verte- 

 brata, 185, 186; of plants, 

 190 

 Associated movements, 110, 111 

 Auricles, 69, 70, 72, 157 

 Auriculo-ventricular valves, 71 

 Aves, 188 



Axial skeleton (see Spinal col- 

 umn) 



Backbone, 104 



Bad air, 44 



Ball and socket joint, 110 



Bees, 184 



Beetles, 184 



Beverages, 54 



Bilateral symmetry, 149, 152, 



155 

 Bile, 58 

 Birds, 185, 188 

 Bladder, 60 

 Blastula, 91, 92 

 Blood, 31, 32, 43, 57, 76, 77 

 Blood, composition of, 75, 80 

 Blood, corpuscles of, 75-81, 99 

 Blood plasma, 80 

 Blood pressure, 116 

 Blood, regulation of flow, 69-75 

 Blood vessels, 32, 33 

 Blushing, 83 

 Body cavity, 147, 157 

 Body temperature, 75, 82, 83 

 Bones, 104, 185 

 Brain, 112, 113, 173 

 Branchiae (see Gills) 

 Branchial hearts, 157 

 Bread, 54 



Breakfast foods, 54 

 Breathing (see Respiration) 



205 



