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. 
Geological Society, 
Sept. I, 1821. 
It is requested that all letters and communications to the 
Secretaries, and presents to the Society, be addressed to the House of 
the Geological Society, No. 20, Bedford Street 9 Covent Garden, London » 
