KEY TO TERRESTRIAL HISTORY 289 



forms live for us again ; some day we hope to awaken the 

 sleeping Princess, and to learn from her the whole truth. 

 Whatever fate attend our quest, let us not forget that we 

 should never have set out upon it, but for the identifica- 

 tion of strata by fossil remains, the key to terrestrial 

 history, delivered to us by William Smith. 



