x CONTENTS 



CHAPTER VII 



PAGE 



INSECTICIDES IN GENERAL: STOMACH POISONS 43 



Materials classified Conveyance Dusts Sprays Arsenic Disadvan- 

 tages Paris green Disadvantages Standard formula Variations 

 Arsenate of lead Standard formula Arsenate of lime Standard formula 

 Poison baits Hellebore Commercial Sodium Fluorid. 



CHAPTER VIII 



CONTACT INSECTICIDES 49 



Purposes of contact insecticides Kerosene emulsion Miscible* oils 

 Whale-oil soap Common soap Nicotine Nicotine sulfate Lime sulfur 

 wash- Dry sulfur compounds Sulfur Pyrethrum, insect powder, or 

 buhach. 



CHAPTER IX 



INSECTICIDES AND FUNGICIDES: FUMIGATION 54 



Combinations of spray materials Of insecticides Of insecticides and 

 fungicides Injurious combinations fumigation Nature of its action 

 Limits of availability Carbon disulfid Nicotine Sulfur Hydrocyanic- 

 acid gas. 



CHAPTER X 



THE RELATIONSHIPS OP INSECTS 59 



Classification The development of animals in the past Artificial and 

 natural classifications The original insects The development of diversity 

 Resultant groups Relations of species, genera, families etc. A sample 

 tree-like classification Table of classification. 



CHAPTER XI 



THE APTERYGOTA 62 



General structure Distinctive characters General description Divisions 

 of the group Order Thysanura Distinctive characters The Silver Fish 

 Order Collembola General features Distinctive characters General 

 account. 



CHAPTER XII 



THE PTERYGOTA. THE EPHEMERIDA 65 



General considerations on the Pterygota The Ephemerida General 

 description and structure Distinctive characters Life and habits 

 Importance. 



CHAPTER XIII 



THE ODONATA 68 



General description and structure Distinctive characters Groups of 

 dragon-flies Habits Their life and food Importance Abundance. 



CHAPTER XIV 



THE PLECOPTERA 72 



General description of the group Distinctive characters Life and habits 

 Abundance Economic importance. 



