CONTENTS 



PART I 

 FRIENDS AND FOES AMONG THE WEEDS 



CHAPTER PAGE 



I. THE WEEDS OF ROADSIDES AND WASTE PLACES i 



II. THE WEEDS OF MEADOWS AND PASTURES . . . .13 



III. THE WEEDS OF GARDENS AND CULTIVATED FIELDS . . 31 



IV. THE WEEDS OF GRAIN AND FORAGE CROPS ... . 45 

 V. THE ECONOMICS OF WEEDS . . . . . .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 122 



X. COLEOPTERA: THE BEETLES 13! 



XI. HYMENOPTERA : THE ANTS, BEES, WASPS, AND SAWFLIES . 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 



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