174 FORMATION OF CORAL REEFS. 



these, there are certain plants, limestone Alga?-, 

 Corallines, as they are called, which have 

 their share also in the work. 



I had intended to give some account of the 

 Coral Reefs of Florida, and to show what bear- 

 ing they have upon the question of time and 

 the permanence of Species ; but this cursory 

 sketch of Coral Reefs in general has grown to 

 such dimensions that I must reserve a more 

 particular account of the Florida Reefs and Keys 

 for a future article. 



