CONTENTS. ix 



PAGE 



e. Histolysis of the Tracheci; of the Larva, and De- 

 velopment of the Tracheae of the Pronymph - 306 

 / Histolysis of the Fat Bodies and other Larval 



Tissues . . - - - 307 



g. Histolysis and other Changes in the Alimentary 



Canal - - - - - - 3 ' ^ 



/i. The Position of the Neuroblast and the Develop- 

 ment of the Stomodasum of the Pronymph - 313 

 Sec. 2. The Development of the Nymph - - - 31 5 



a. The Position of the Imaginal Discs in the Pro- 

 nymph - - - - - - 3 ' 5 



l>. Development of the Integument of the Head and 



Thorax - - - - - - 318 



c. Changes in the Neuroblast and Development of the 



Peripheral Nerves ... - 324 



e. The Pupa-sheath . . . . - 330 



f. Changes in the Alimentary Canal - - -331 



g. Origin of the Mesoderm - - - - 333 

 h. Development of the Dorsal and Sterno-dorsal 



Muscles --.--- 336 



/. The Tracheal System of the Nymph - - 338 



/'. The Dorsal Vessel and Coelom - - - 340 



Sec. 3. The Development of the Imago from the Nymph - 344 



Appendix to Chapters VI. to IX. — Methods of Study - - 347 



Bibliographies.— 1 to 3, p. i ; 4 to 10, p. 7 ; 11 to 15, p. 25 ; 16 to 27, 

 pp. 32, 33 ; 28 to 30, p. 62 ; 31 to 35, p. 72 ; 36 to 41, pp. 99, 100 ; 42 to 

 48, p. 106 ; 49 and 50, p. 119; 51 to 71, pp. 127, 128 ; 72 to 81, pp. 154, 

 155 ; 82 to 89, p. 190 ; 90 to 95, p. 198 ; 96 to 115, pp. 230, 231 ; 116 to 

 121, p. 235 ; 122 to 136, pp. 262, 263 ; 137 to 139, p. 276 ; and 140 to 147, 

 p. 292. 



ERRATA. 



Page 17, line 8, for 'hypoblast behind,' read 'hypoblast behind the 



blastopore.' 

 Page 33, last line, for ' xvi.' read ' xiv.' 

 Page 65, in footnote, for ' K. L. C read ' C. L. C 

 Page 77, in footnote, for ' Chironomus ' read ' Corethra.' 



