L ip 



CONTENTS. 



PREFACE v 



INXRODUCTORY NOTE ox HOMOLOGIES OF INSECTS.. vii 



PART l.-GENERAL OBSERVATIONS ON THE ANATOMY AND 

 PHYSIOLOGY OF THE FLY. 



Section I. Introductory Remarks 1 



SectionIL Development , 6 



Section III. The Integument 9 



Section IV. The Xervous System 13 



Section \. The Wings and Legs , 18 



Section \LT/ie Digestive System 22 



Section VII. The Circulation 23 



Section VIII. The Respiratory System 25 



Section IX. The Fat bodies and Ductless Glands. ... 29 



Section X. The Organs of Special Sense 30 



SeccionXI. The Generative Organs 34 



Section XII. Concluding Remarks 35 



