xviii TABLE OF CONTENTS 



CHAPTER PAGE 



IX. PLANTS IN THEIR RELATION TO HUMAN WELFARE . 126 



I. Some of the Uses of Plants to Man .... 126 



II. The Uses of Forests and Forest Conservation . . 132 



III. Fungi and their Relation to Human Welfare . . 139 



X. PLANT CLASSIFICATION 154 



I. (Optional.) Common Methods of Classification . 154 



II. (Optional.) Scientific Methods of Classification . 158 



ANIMAL BIOLOGY 



I. INSECTS 1 



I. Butterflies and Moths 1 



II. Grasshoppers and their Relatives .... 22 



III. Bees and their Relatives 31 



IV. Mosquitoes and Flies . . . . .43 

 V. (Optional.) Additional Topics on Insects . . 59 



II. BIRDS 62 



I. Characteristics of Structure 62 



II. Reproduction and Life History .... 69 



III. Methods of Classification 73 



IV. Importance of Birds to Man 83 



V. Decrease in Bird Life . . . . . .91 



VI. Conservation of Birds 97 



III. FROGS AND THEIR RELATIVES 101 



IV. FISHES 120 



I. Characteristics of Structure 120 



II. Adaptations for Nutritive Functions . . . 125 



III. Reproduction and Life History .... 137 



IV. Importance of Fishes to Man .... 141 

 V. Conservation of Food Fishes . . . 147 



