ADVERTISEMENT. 



THE Editors of the Transactions of the Geological Society are directed to 

 make it known to the Public, that the Authors alone are responsible for the facts and 

 opinions, contained in their respective papers. 



It is requested that all letters and communications to the Secretaries, and 

 presents to the Society, may be addressed to the Apartments of the Geological Society, 

 Somerset House, London. 



