CHARLES A. POULSON, Esq, 
Member of the Academy of Natural Sciences , cpc. 
Dear Sir, — I take the liberty to dedicate this 
volume to you, whose liberality has afforded the 
friends of science the use of a library, richer in 
works on Conchology than any other in the United 
States; and of a collection of shells almost unrivalled 
by any private cabinet. It is therefore with great 
pleasure that I embrace this occasion to acknowledge 
my obligations to you; and I sincerely wish that so 
pleasing and instructive a study as that of Natural 
Science may long continue to amuse your leisure 
hours. 
I am, dear sir, 
Your obedient servant, 
T. A. Conrad. 
Philadelphia , April 4, 1834. 
