CONTENTS 



PAGES 



Galls and gall insects 94-95 



On the argument that the lower cannot produce the 



higher 95 



On the sensitiveness of plants 96-99 



Fruit worms 99-102 



Butterflies, their metamorphoses and egg laying . . 102-107 



Parasites of cabbage butterfly 107 



Willow galls 108-109 



No other caterpillars produced by trees 109-113 



Internal parasites 113-116 



Lice and other external parasites 1 16-125 



Conclusion 126 



Plates 127-155 



Index i57 



