INDEX 



219 



Growth, necessity of foods for, H. B., 



45. 



Growth of crystals, P. B., 2, foot- 

 note. 



Growth of living things, P. B., 2, 30. 

 Growth of plants, five essential con- 

 ditions for, P. B., 108. 

 Guard-cells of stoma, P. B., 58, 61, 62, 



Fig. 21. 



Gull, A. B., Fig. 59. 

 Gullet, 



of fish, A. B., 130. 

 of frog, A. B., 108. 

 of man, H. B., 92. 

 of paramecium, A. B., 165. 

 Gymnosperms, P. B., 159, 170. 

 Gypsy moth, A. B., 16, Fig. 13. 



Habit, importance of, H. B., 159.. 

 Habits, hygienic, 



of breathing, H. B., 132. 



of eating, H. B., 102. 

 Habitual activities, H. B., 158. 

 Hair, care of, H. B., 141. 

 Harrow, P. B., 114, Fig. 51. 

 Hatchery, A. B., 141. 

 Hawk, A. B., 78, 87, 89, 91, Fig. 64. 

 Hay crop of New York State, P. B., 



122. 



Headache powders, H. B., 78. 

 Heart, 



of fish, A. B., 131, Fig. 100. 



of frog, A. B., 107, 111. 



of man, H. B., 1, 109. 

 Heat, 



energy, P. B., 64. 



relation of, to soil, P. B., 112. 



production of, in man, H. B., 122. 

 Hemoglobin, H. B., 128. 

 Hemp, P. B., 130, 145. 

 Hen, egg of, A. B., Figs. 52, 54, 56. 

 Herb, P. B., 156, Fig. 80. 

 Heron, A. B., Fig. 60. 

 Herring, A. B., Fig. 110. 

 Herring gull, A. B., Fig. 59. 

 High school education, value of, P. B., 



124. 



Hilum, P. B., 97. 

 Hodge, Professor C. F., 



experiments on dogs, H. B., 68-72. 



extermination of house fly, A. B., 



59. 



Honeybees, A. B., 33-41. 

 Honey, making, A. B., 39. 

 Honey stomach, A. B., 39, Fig. 28. 

 Hoof, A. B., 188. 

 Horse, A. B., Fig. 137. 

 Horse-chestnut, 



leaves, P. B., Fig. 20, K. 



stem, P. B., 45, 52. 

 House fly, A. B., 57, 58, Fig. 40, 41. 

 House mosquito, A. B., 43. 

 Human welfare, relation of plants to, 



P. B., 126-153. 



Humming bird, egg of, A. B., Fig. 56. 

 Humus, P. B., 111. 

 Hybrid fruits, P. B., 122. 

 Hydra, A. B., 176, Figs. 124, 125. 

 Hydrogen, P. B., 9. 

 Hydrophobia, H. B., 41, 170. 

 Hygiene, 



of blood, H. B., 108. 



of circulation, H. B., 119-121. 



of digestion, H. B., 102-105. 



of eyes, H. B., 165. 



of muscles, H. B., 151. 



of nervous system, H. B., 160. 



of red corpuscles, H. B., 128. 



of respiratory organs, H. B., 132. 



of teeth, H. B., 89. 

 Hyphae of molds, P. B., 150. 

 Hypocotyl, P. B., 98. 



Importance of birds to man, A. B., 



83-91. 

 Importance of proper cooking, H. B., 



52. 

 Improvement of plants by man, P. B., 



119-125, Figs. 57, 59. 

 Incisor teeth, A. B., 188; H. B., 86. 

 Incomplete metamorphosis, A. B., 



29. 



Incurrent siphon, A. B., 184. 

 Indigestible foods, avoidance of, 



H. B., 62. 



Indigo, preparation of, P. B., 145. 

 Infantile paralysis, H. B., 41. 

 Injurious birds, A. B., 88. 



