CONTENTS. 



CHAPTER III. 



FORMATION OF CORAL REEFS AND ISLANDS, AND CAUSES OF 

 THEIR FEATURES. 



I. Formation of Reefs 



I. Origin of Coral Sands, and of the Reef-Rock . 



II. Origin of tlie Sliore Platform ..... 



III. EflTects of Winds and Gales ..... 



II. Causes ModifvinCx the Forms and Growth of Reefs 

 I. Barrier and P'riniiinji Reefs ..... 



II. Atoll Reefs 



III. Rate of Growth of Reefs 



IV. Origin of the Barrier Condition of Reefs, and of 



THE Atoll Form of Coral Islands . 



1. Old Views 



II. Origin of Channels ^^•ithin Barriers .... 

 III. Origin of Lagoons of Atolls ..... 



V. The Co.mpleted Atoli 



CHAPTER IV. 



GEOGRAPHICAL DISTRIBUTION OF CORAL REEFS AND ISLANDS. 



189 

 196 

 200 



203 



203 

 211 



212 



218 



218 

 220 



227 



233 



255 



CHAPTER V. 



CIIANGFS OF LEVEL IN THE PACIFIC OCE.A.N. 



I. Evidences of Change of Level 

 II. Subsidence indicated by Atolls and Barrier Reefs 

 III. Effect of the Subsidence .... 

 IV. Period of the Subsidence .... 

 V. Elevations of Moilern Eras in the Pacific 



272 

 274 

 282 

 2 84 

 2S4 



CHAPTER VL 



GEOLOGICAL CONCLUSIONS. 



I. Formation of Limestones .... 

 II. Beds of Limestone with Living Margins . 



299 



