xviil TABLE OF CONTENTS 



CHAPTEB PAGB 



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 



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



ANIMAL BIOLOGY 



I. INSECTS . . " . , ; _* . ..'..; f \ . . 1 



I. Butterflies and Moths 1 



II. Grasshoppers and their Relatives . V . 22 



III. Bees and their Relatives . '. >, , . . 31 



IV. Mosquitoes and Flies . . . / . . . . . 43 

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



IE. 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 



