CONTENTS 



PAGE 



CHAPTER 



Preface "^^ 



Contents ^^ 



List of Plates ^^ 



List of Drawings in the Text xin 



' I. Introduction , . * j'tr / ^ 



Structure and Function in Insects, i. Breathing and i< ced- 

 ing, 3. Nerve-action, 7. Reproduction and growth, 10. 

 Definition of the Class, 13. 



II. Feeding and Breathing • *, ^^ 



Living Cells and Protoplasm, 15. Jaws for Biting and 

 Sucking, 17. Digestion, 25. Blood and Circulation, 32. 

 Absorption, 36. Excretion, 38. Breathing, Air-tubes, 39. 



in. Movement . . . •-,..' ' c r ' fir ^'^ 



Muscles, 47. Motion of Legs, 50 ; of Wings, 54 ; ot Jaws, bi. 



IV. Sensation and Reaction • .69 



Stimulation and Response, 69. Impulse and Reflex, 70. 

 Touch, 72. Smell and Taste, 73. Equilibration and Hear- 

 ing, 77- Sight, 83. 



V. Behaviour, Instinctive and Intelligent . . ^ . 94 

 Action Conscious and Purposive? 94. Tropisms, 95. Auto- 

 matic and Routine Activity, 102. Experience and Adapta- 

 tion, 103. Memory and Individuality, 106. Apparent 

 Prevision, 107. Change of Behaviour, no. 



VL Reproduction and Heredity . . _„,.•..*_/ "^ 

 Germ-cells: Sperms and Eggs, 114. Cell-division, ii5. 

 FertiHsation and Maturation, 117. Inheritance ; Mendel s 

 "Law," 121. Sex-determination, 125. Gynandromorptis 

 and Intersexes, 131. Parthenogenesis, 137. Genital Organs, 

 Ovipositor and Armature, 141- Secondary Sexual <^ha- 

 racters, 147. 



VII. Growth and Transformation . • * ^ '. • V ^^° 



Embryo and its Development, 150. Germ-layers; Origin ot 

 Endoderm, 153. Vestigial Appendages, 158. Hatching and 

 Moults, 159. Direct Growth and Transformation, 102. 

 Imaginal Buds, 173. Forms of Larvae, 176. Divergence m 

 mode of Wing-growth, 186. Nature of Pupa, 191. ^irtli 

 of Young, 195. Paedogenesis, 196. Polyerabryony, 197- 



IX 



37304 



