INDEX. 



Absolute alcohol, 175, 178. 



Acephala, 138. 



Acrididae, 36. 



Age of fishes, 102; of reptiles, 



102 ; of invertebrates, 102. 

 Agricultural ant, 53. 

 Agrionidae, 47, 172. 

 Air bladder, 88. 

 Air sacs, 115. 

 Air tubes, 30. 

 Alcohol, 176. 



Alternation of generations, 156. 

 Amceba, 163, 175. 

 Amphioxus, 133. 

 Analytical tables for determining 



the families of insects, 185-202. 

 Anosia plexippus, 36, 171. 

 Ant, agricultural, 53. 

 Ant, leaf-cutting, 53. 

 Ants, 53. 

 Aquaria, 175. 

 Arachnida, 63. 

 Araneina, 63. 

 Archseopteryx, 119. 

 Argiope riparia, 172. 

 Arthromeres, 152. 

 Arthropoda, 13-78, 164. 

 Articulates, 164. 

 Astaous, 74. 

 Authority, 36. 



Bacteria, 175. 

 Basilarchia archippus, 36. 



Batrachians, 100. 



Beavers, 130. 



Beeswax, 59. 



Beetle, 37, 171. 



Bell animalcule, 160. 



Belostoma americanum, 39. 



Benacus griseus, 39. 



Bilateral symmetiy, 153. 



Birds, 104, 113. 



Bivalves, 138. 



Blattidee, 31. 



Blood corpuscles, 95. 



Bolhvorm, 37. 



Bombycidse, 36. 



Bombyx mori, 36. 



Bot flies, 45. 



Brachiopods, 149. 



Branches of Animal Kingdom, 77, 



167, 182. 

 Breathing, of grasshopper, 33 ; of 



flsh, 86 ; of frog, 94 

 Budding, 156. 

 Bumblebee, 47. 

 Butterfly, 32, 171. 



Calcareous shell, 120. 

 Cambarus, 74. 

 Carchesium, 161. 

 Carpet beetle, 38. 

 Caterpillar, 33, 171. 

 Cecropia moth, 35, 171. 

 Cell, 99, 158, 164, 166. 

 Centaur, 133. 



303 



