t 



Coral reefs are the work of organic beings which 

 ejcist in inappreciable numbers . They consist of 

 agcibuiinated. skeletons of departed, races of polypi, 

 composed of carbonate of Ume , cemented into 

 hard calcareous rode . 



e^gen 



OCEAN 

 Madagascar 



" Bengal. 



, action. . The. coTie emits vast vo 



fa weiglrb three- ancL four tons . 



jrf. Gravel 

 >i.Crn,, C/,n 



'k.CoIite Kai Sand-rtone 

 7 , Limestone , Dei'onian 

 ft. Gneiss. (,><irt .- , (irmiiti- 

 i. C,r,'i-n.tlom- /'o/y/M ri 



Cape I',' s Laxid 



A ran.:, 



