CONTENTS 



CHAPTER I 

 SEA FARMING 



PAGE 



A national inventory of resources Waste by earlier genera- 

 tions Extinction of undomesticated food organisms in- 

 evitable Achievements in the domestication of terrestrial 

 animals and plants Sea farming What has been ac- 

 complishedWhat may be hoped for I 



CHAPTER II 



NOTES ON THE ANATOMY OF THE FOOD 

 MOLLUSKS 



The shell Its parts Pearls Attachment of the oyster The 

 mantle The digestive tract The palps or lips Mouth, 

 stomach, and intestine The vascular system The heart 

 The excretory organs Sexual organs Hermaphrodit- 

 ism The nervous system The foot Creeping, digging, 

 and spinning the byssus Swimming by means of the foot 

 Structure of the gills of Mytilus, Pecten, and Ostrea . II 



CHAPTER III 

 DEVELOPMENT 



Structure of the male and female cells Preparation of the 

 ovum for fertilization Fertilization Segmentation 

 Formation of organs Attachment 39 



CHAPTER IV 

 CILIARY MECHANISMS 



The food of bivalves The normal process of feeding The 

 gills as food collectors Transfer of food to the mouth 

 by gills and palps The mud problem and its solution 

 Cilia tracts on the mantle of Venus leading backward 

 in the mantle chamber How mud is discharged from 



vii 



