196 



THE WORLD. 



The order of succession which we have" given has been de- 

 termined by a series of the most patient investigations, and from 

 an immense accumulation of facts, collected by able observers in 

 all parts of the globe. On page 194 we have given a diagram 

 showing their order. It will be perceived that some parts of the 

 representation are necessarily exaggerated. Commencing at the 

 left we have the hypogene, or underlying rocks, unstratified and 

 stratified ; then the primary and secondary fossiliferous, and also 

 the tertiary, lastly the volcanic. The alluvium we have placed 

 in various situations, overlaying the older rocks. 



