CONTENTS 



PART I 

 FRIENDS AND FOES AMONG THE WEEDS 



CHAPTER PAGE 



I. The Weeds of Roadsides and Waste Places . 



II. The Weeds of Meadows and Pastures . 



III. The Weeds of Gardens and Cultivated Fields 



IV. The Weeds of Grain and Forage Crops . 

 V. The Economics of Weeds 



I 



13 

 31 



45 

 55 



PART II 

 FRIENDS AND FOES AMONG THE INSECTS 



VI. Orthoptera: the Grasshoppers, Crickets, and Cock- 

 roaches 65 



VII. Hemiptera: the True Bugs 73 



VIII. The Butterflies and Moths 96 



IX. The Two-winged Flies . . . . . 1-22 



X. Coleoptera: the Beetles 131 



XI. Hymenoptera : THE Ants, Bees, Wasps, and Sawfues . 149 



XII. Insecticides and their Application 155 



XIII. The Predaceous Insects 163 



XIV. The Four- winged Parasites 174 



XV. The Two- winged Parasites 188 



XVI. The Pollination and Fertilization of Flowers . .194 



XVII. The Insect Pollinators 203 



PART III 

 FRIENDS AND FOES AMONG THE FUNGI 



XVIII. The Mushrooms, Toadstools, and Molds . . .215 



XIX. The Downy Mildews 219 



XX. The Smut Fungi 226 



XXI. The Rusts . . . . , 231 



V 



