iv CONTENTS. 
CHAPTER 
Src. 4. The Development of the Alimentary Canal - - 
a In the Embryo - - - - - 
6. After Development - - - - - 
XII. THE NERVOUS SYSTEM - - - - - - 
Src. 1. Anatomy of the Nerve Centres - - - 
a. The Thoracic Nerve Centre of the Blow-Fly Imago - 
6. General Structure of the Brain in the Arthropoda - 
c. Details of the Structure of the Brain of the Blow-Fly 
Imago - - - - - = 
d. The Sensory Ganglia - - - - 
Src. 2. The Physiology of the Nervous System in Nuinooees 
» 3. The Development of the Nervous System - - 
XIII. Tor SENSES AND SENSORY ORGANS - - r 
Src. 1. Sensation in Insects’ - - - : - 
» 2. Organs of Vision - - - - - 
» 3. The Median Ocelli, Stemmata, or Simple Eyes - 
a. The Stemmata of the Blow-Fly — - - - 
é. Morphology and Comparative Anatomy of Simple 
Eyes in Arthropods - - - - 
Src. 4. General Remarks on the Compound Eye - - 
» 5. The Compound Eye in the Blow-Fly - - - 
a. Structure of the Dioptron - - - - 
6. The Retina and Optic Nerve - - - 
Src. 6. The Development of the Compound Eye - - 
a. In the Arthropoda generally - - - 
é. The Development of the Compound Eye in the 
Blow-Fly_ - - - - - 
. The Theory of Arthropod Vision - - - 
,, 8. Further Remarks on the Optical Properties of the 
Compound Eye” - - - - - 
n 
5 
9 
N 
a. On the Optical Properties of Refractive Cylinders, 
and the probable Relation of the several Types of 
Compound Eye in the Arthropoda - - 
6, On the Illumination of the Retinal End Organs under 
the Dioptric and Mosaic Theories of Vision - 
c. Accessory Optic Phenomena in the Compound Eye 
d. Optical Constants of the Compound Eye of the 
Blow-Fly - - - - - - 
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