Vili CONTENTS. 
Tegumentary skeleton of abdomen, its development 
And mode of construction .. oe ns 
Muscles, general arrangement of 
RESPIRATORY SYSTEM : 
Physiological peculiarities of .. ar ee 
Spiracles, abdominal, their structure in wasps. . 
In the humble-bee_ .. se ee ee 
Thoracic spiracles wie ; “? 
Their functions, respiratory Aue youl 
Sourds produced by insects in two ways : 
1. By attrition .. os “6 os os 
2. By currents of air... os 
Cause of the sound of neers in flies 
In-wasps and bees... oe . os 
Trachee and air-vesicles, their inannaiient .s 
Structure oe ee e. ee 
And secondary ieuantiiig - es 
ORGANS OF THE CIRCULATION : 
Movements of the heart in-the larva .. ta 
Structure and distribution of the arterial system 
Return of the blood by definite channels ve 
Peculiarities of the circulation in insects. 
Nature of their blood .. 
Nervous System: 
Its general plan, structure e's ve 
And physiological peculiarities o 
Insects, how far capable of pain ee ve 
CuapteR VI—ANATOMY AND PHYSIOLOGY. 
DIGESTIVE ORGANS: 
Physiology of insect digestion .. oa os 
Fat masses, their structure ‘a 
And general purpose pe os 
The source of bees-wax ss ae 
Honey-making ? wasps ve es ve 
The crop and esophagus, their structure and function 
Structure of the alimentary canal in general .. 
Stomach, its structure and relations .. sh 
Glandular system of insects .. ¥ 2s 
ee 
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