CORALS 



159 



Coral polyps in the past have helped forward the 

 structure of islands and continents, and have been 

 among the great elevating agencies continually at 

 work in opposition to the wearing away or degrading 



Fig. 46. Coral Polyps. 



influences. During man's time on this earth they have 

 lived, and without cessation have secreted from the 

 warm ocean waters the carbonate of lime we call coral. 

 And still their work goes on, and islands are being 



