INDEX 



21? 



Exercise, importance of, H. B., 102, 



120, 129, 133, 151, 160. 

 Existence, struggle for, P. B., 114- 



119, Fig. 53. 

 Exodus, A. B., 30. 

 Expiration, H. B., 124, 132. 

 Extermination, 



of house fly, A. B., 57. 



of mosquitoes, A. B., 54, Figs. 38, 



39. 



External ear, H. B., 166. 

 Eye, 



of bee, A. B., 31. 



of bird, A. B., 62. 



of butterfly, A. B., 6. 



of crayfish, A. B., 156. 



of fish, A. B., Fig. 90. 



of frog, A. B., 104. 



of grasshopper, A. B., 22. 



of man, H. B., 162, 165. 



False foot, A. B., 170, 171. 

 Family, plant, P. B., 160, 170. 

 Farsightedness, H. B., 164. 

 Fat, 



composition of, P. B., 14, 15. 



digestion of, H. B., 98. 



in human body, H. B., 44. 



test for, P. B., 19. 



uses of, H. B., 51. 

 Feathers, A. B., 67, Figs. 49, 50. 

 Feeding of birds, A. B., 99. 

 Fehling's solution, preparation of, 



P. B., 17. 

 Femur, 



of bee, A. B., 33. 



of grasshopper, A. B., 24. 

 Fermentation, P. B., 148. 

 Ferments, 



digestive, P. B., 38. 



in fish, A. B., 131. 



in frog, A. B., 110. 



in gastric juice, H. B., 94. 



in saliva, H. B., 92. 

 Ferns, P. B., 161-164, Figs. 82, 83. 

 Fertilization, P. B., 76, 77, 88. 



in bees, A. B., 36. 



in bird, A. B., 70. 



in butterfly, A. B., 11. 



in fish, A. B., 139. 



in frog, A. B., 114. 



in grasshopper, A. B., 28. 



of egg cell in fern, P. B., 163. 

 Fertilized egg-cell, P. B., 77. 

 Fertilizers, P. B., 114. 

 Fiber-producing plants, P. B., 130- 



132. 



Fibers, P. B., 47. 

 Fibrous bark, P. B., 46. 

 Field work on birds, A. B., 82. 

 Filament, P. B., 71, 73, 88, Fig. 25. 

 Fins, 



of goldfish, A. B., 126. 



of other fish, A. B., 125. 



of perch, A. B., 121. 

 Fire, 



lanes, P. B., 139. 



wardens, P. B., 139. 

 Fish, A. B., 120-149. 

 Flamingoes, A. B., Fig. 61. 

 Flavoring extracts. P. B., 128. 

 Flavors, 



of food, P. B., 145. 



relation of bacteria to, H. B., 22. 

 Flax, P. B., 130. 

 Fleshy fruits, P. B., 93, 96. 

 Flies, A. B., 57-59. 



and typhoid fever, H. B., 37. 

 Floods, prevention of, P. B., 136. 

 Floral envelopes, P. B., 71, 72, 79, 88 

 Flounder, A. B., Fig. 93. 

 Flowers, P. B., 70-88. 



gladiolus, P. B., 72-74. 



pansy, P. B., 79-82. 



tulip, P. B., 70-72. 

 Fly-catchers, A. B., 80, Fig. 69. 

 Food, definition of, H. B., 46. 

 Food economy, H. B., 56-60. 

 Food getting, 



of amoeba, A. B., 171. 



of bee, A. B., 32, 39. 



of butterfly, A. B., 7, 11. 



of crayfish, A. B., 157. 



of fish, A. B., 128. 



of frog, A. B., 104, 110. 



of hydra, A. B., 177. 



of mussel, A. B., 182. 



of paramecium, A. B., 165, 168. 



