CONTENTS. 



CHAPTER I. 



STRUCTURE OF CORAL REEFS AND ISLANDS. 



Page. 



1. General Features of Coral Reefs and Islands, 5 



Coral Reefs, 5 



Coral Islands, 6 



2. Characters of Fringing and Barrier Reefs. 



General Features, 7 



Structure of Reef Formations, . . . „• 9 



Outer Reefs, 9 



Inner Reefs, 11 



Channels among Reefs, 13 



Shore Accumulations, 15 



Beach and Drift Sandrocks, 16 



3. Coral Islands. 



Forms and Features of Coral Islands, 20 



Soundings about Coral Islands, 24 



Structure of Coral Islands, 26 



The Completed Coral Island, 43 



CHAPTER II. 



STRUCTURE GROWTH AND HABITS OF CORAL ZOOPHYTES. 



Structure and Growth of Zoophytes, 47 



Texture and Composition of Corals, 55 



Causes influencing the Growth of Coral Zoophytes, 59 



Rate of Growth of Zoophytes, 66 



