CONTENTS. 



INTRODUCTION. .... Pages 1-7 



CHAPTEE I. 



HABITS OF WORMS. 



Nature of the sites inhabited Can live long under 

 water Nocturnal Wander about at night Often 

 lie close to the mouths of their burrows, and are 

 thus destroyed in large numbers by birds Structure 

 Do not possess eyes, but can distinguish between 

 light and darkness Retreat rapidly when brightly 

 illuminated, not by a reflex action Power of atten- 

 tion Sensitive to heat and cold Completely deaf 

 Sensitive to vibrations and to touch Feeble 

 power of smell Taste Mental qualities Nature 

 of food Omnivorous Digestion Leaves, before 

 being swallowed, moistened with a fluid of the 

 nature of the pancreatic secretion Extra-stomachal 

 digestion Calciferous glands, structure of Cal- 

 careous concretions formed in the anterior pair of 

 glands The calcareous matter primarily an excre- 

 tion, but secondarily serves to neutralise the acids 

 generated during the digestive process . 8-56 



