INDEX 



Numbers refer to pages. 



Abiogenesis, 32, 36. ' 



Absorption, in metazoa, 17; in Para- 

 mecium, 15. 



Acetabulum, in frog, 48; in man, 47; in 

 pigeon, 49. 



Acris, 58. 



Adaptation, 62, 68. 



Adductor muscle, 63, 64. 



Aeolosoma, 54; budding in, 34. 



Aganides, 71. 



Aggregations, of cells, 23, 31; of many- 

 celled individuals, 30, 31. 



Alphabet, free-hand lettering, 4. 



Alternation of generations, 35, 36. 



Ambystoma, 58. 



Ambystoma tigrinum, birth stage of, 39; 

 eggs of, 38. 



Ammonite, 71. 



Amoeba, 10, 13, 51. 



Amphiaster, 22. 



Amphibia, 56, 57, 58. 



Anaphase, 20, 22. 



Anguis, 59. 



Animal pole, 42. 



Annelida, 54. 



Anodonta, 55, 62. 



Anus, of earthworm, 28. 



Aphid, parthenogenesis in, 35.' 



Apoda, 58. 



Arthropoda, 55. 



Ascaris, 53, 54; cell division in, 21, 22; 

 maturation of eggs in, 40, 41, 42. 



Aster, 22. 



Astral ray, 20. 



Attraction-sphere, 21, 22. 



Aves, 57. 



Backbone, 56. 

 Bascanion, 59. 

 Bilateral symmetry, 53, 55; in earthworm, 



26. 



Biogenetic law, 46. 

 Birge net, 64. 

 Birth stages, 39. 



Bison, distribution of, 68; teeth of, 69. 



Blastopore, of frog embryo, 43. 



Blastostyle, of Obelia, 30, 31. 



Blastula, of frog, 43. 



Blood, 9; human, 12. 



Blood system, of earthworm, 28. 



Bone, 12. 



Bowman's capsule, 18. 



Brain, of earthworm, 29; of frog embryo, 

 43. 



Brooding habits, 39. 



Brood pouch, of frog, 39; of Hippocam- 

 pus, 39; of kangaroo, 39; of marsupial 

 (opossum), 39. 



Bryozoa, 30. 



Buccal pouch, of earthworm, 28. 



Budding, in Hydra, 33; in Nais, Aeolo- 

 soma, Chaetogaster, Dero, Microsto- 

 mum, 34; in sponge, 33. 



Bufo, 58. 



Bugula, 30. 



Byssus, 64. 



Cambarus, 55. 



Canaliculi, of bone, 12. 



Carbohydrate, 17. 



Carbon dioxide, 18. 



Carboniferous, 71. 



Carchesium, 23, 52. 



Carpals, 47; of frog, 48; of man, 47; of 



pigeon, 48. 



Carpo-metacarpus, of pigeon, 48. 

 Cartilage, 11. 

 Caudata, 58. 

 Cell, 8; inclusions, 11; membrane, 8, 20; 



structure of, 8, 9; wall, 9. 

 Cell aggregation, 23. 

 Centrosome, 20, 22. 

 Cephalopoda, 70, 71, 74. 

 Cephalothorax, 55. 

 Centrum, 60. 

 Ceratite, 71. 

 Ceratites, 71. 

 Chaetogaster, budding in, 34. 



75 



