TO CORRESPONDENTS. 



The Paper " On Single and Erect Vision," in our next Number. 

 Mr. Martin's « Geological Memoir on a Part of Western Sussex 

 has been received, and will be noticed in our next. 



*** The Editors request that all Communications intendedfor immediate 

 insertion may be sent to the care of Mr. Richard Taylor, Printing Office, 

 Red Lion Court, Fleet Street, London, at furthest by the 1 5ih day of the 

 month, or they mil be too late to appear in the ensuing Number. 



PHILOSOPHICAL MAGAZINE. 



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