CONTENT s:. 
CHAPTER 
X. THE TRACHEAL SYSTEM OF THE IMAGO - - - = 
Sec. 1. General Morphology and Development of the Tracheal 
System in Insects - - - - - 
a. General Arrangement - - - - - 
6. Development - - - - - - 
¢. Morphological Significance - - - - 
Src. 2. The Tracheal System of the Blow-Fly - - - 
a. The Spiracles and Spiracular Sacs_ - - - 
é. Structure of Tracheee and Air Sacs_ - - - 
SEc. 3. The Development of the Tracheal System in the Blow- 
Fly - - - = - - - 
Src. 4. The Physiology of Respiration in Insects - - 
APPENDIX TO CHAPTER X.—Calculation of Work done in Flight 
XI. THE ALIMENTARY CANAL OF THE IMAGO - - - 
Src. 1. The Mouth and Pharynx - - - - - 
» 2. The Soft Parts and Mechanism of the Proboscis - 
a. The Muscles of the Proboscis - . 
6, The Oral Lobes and Structure of the Pseudo-trachez 
c. The Mechanism by which the Proboscis is extended 
and erected - - - : : - 
d. Function of Oral Lobes - - - - 
e. Nerves and End Organs - - - - 
/. Salivary Glands = = 2 : : 
Sic. 3. The CEsophagus, Stomachs and Intestines, and their 
Accessory Glands” - - : : : 
a. The Alimentary Tract - : - - - 
é. The Malpighian Tubes - - : - 
¢. The Rectal Papille  - - - - - 
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