CONTENTS 



CHAPTER IV 



PAGE 



Arkangement of Internal Organs — Muscles — Nervous System — Gang- 

 lionic Chain — Brain — Sense - Organs — Alimentary Canal — Mal- 

 pighian Tubes — Respiration — Tracheal System — Function of 

 Respiration — Blood ok Blood-chyle — Dorsal Vessel or Heart — 

 Fat-body' — Ovaries — Testes — Parthenogenesis — Glands . 114 



CHAPTER V 



development 



Embry'ology' — Eggs — Mioropyles — Formation of Embryo — Ventral 

 Plate — Ectoderm and Endodeem — Segmentation — Later Stages — 

 Direct Observation of Embryo — Metamorphosis — Complete and 

 Incomplete — Instar — Hy'permetamorphosis — Metamorphosis of 

 Internal Organs — Integument — Metamorphosis of Blowfly — His- 

 tolysis — Imaginal Discs — Phy'siology of Metamorphosis — Ecdysis . 143 



CHAPTER VI 



Classification — The Nine Orders of Insects — Their Characters — 

 Packard's Arrangement — Brauer's Classification — Classifications 

 RASED OS Metamorphosis — Super-Orders — The Subdivisions of 

 Orders . . 171 



CHAPTER VII 



The Order Aptera — Definition — Chief Characteristics — Thy'SANura — 

 Gampodea — Japy'x — Jl achilis — Lepisma — Diversity of Internal 

 Structure in Thysanura — Ectotrophi and Entotkophi — Collem- 

 bola — Lipuridae — PoDURiDAE — Smy'nthuridae — The Spring — The 

 Ventral Tube — Abdominal Appendages — Prostemmatic Organ — 

 Tracheal Sy'stem — Anurida maritima — Collembola on Snow — 

 Life-Histories of Collembola — Fossil Aptera — Aptery'gogenea — 

 Antiquity and Distribution of Gampodea . . 180 



CHAPTER VIII 

 Oethoptera — Forfioulidae, Earwigs — Hemimeridae 198 



