PREFACE. vii 



out, by indicating localities where phenomena may be seen, at 

 enabling every one to verify, and study in nature, the state- 

 ments and ideas which are herein set forth. Only in this 

 way can knowledge become valuable, and independence of 

 thought be fostered. 



This elementary study over, I commend the reader to the 

 second volume, in which Mr. Etheridge tells the History of the 

 Strata, with a wealth of fact which has hitherto had no parallel. 



H. G. SEELEY. 



THE VINE, SEVENOAKS, 



September i$th, 1884. 



