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 of 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. 



