Vlll PREFACE. 



Nor have we failed to receive a goodly array of Letters, which, 

 like the Original Articles, treat ' de omnibus rehus et quibusdam 

 aliis ' in Geology and Palaeontology, and, as far as our space has 

 permitted, we have given to each and all a place. We must, how- 

 ever, again beg our Correspondents to make their letters as concise 

 as possible, so as to allow of the insertion of as much variety both of 

 matter and opinion as can be ; bearing in mind that a single letter 

 by its length often shuts out several other communications equally 

 deserving of a place. 



In the matter of Typography and Illustrations, the Artists, 

 Printers, and Publishers have done their very best ; and if only 

 more Subscribers will lend us their aid, we promise them a hundred- 

 fold in return. 



Lastly — If they have not done so alreadj^ Annual Subscribers are 

 earnestly requested to send in their names and subscriptions to 

 Messrs. Trubner & Co., 60, Paternoster Eow, London, E.C. 



The Geological Magazine can be obtained through all Book- 

 sellers in town or country; but if any difficulty or delay arises 

 through this method of procuring it, the Publishers will always be 

 happy to send it direct per post. 



The Editor. 



All Communications for the Geological Magazine should be 

 addressed to the Editor, 142, St. Paul's Koad, Camden Square, 

 N.W. 



Books for Eeview, and Parcels from abroad, sliould be sent 

 addressed to the Editor, at 60, Paternoster Eow, E.C. 



Form for Subscribers to fill up and send to their Booksellers. 



To 



Be pleased to add my name to the List as a Subscriber 

 for one copy of Volume VI. of the Geological Magazine, to be 

 published monthly by Messrs. Trubner & Co., the First Part of 

 which appeared on January 1, 1869, price Eighteenpence each 

 number. 



Signature_^ 



Address 



