TO 



PHILIP HOULBROOKE NICKLIN, M.A. 



MEMBER OF THE AM. PHIL. SOC, 

 AND OF THE ASHMOLEAN SOC. OF OXFORD. 



My dear sir, 



My first acquaintance with this branch of Natural History is con- 

 nected with you ; and when I look back to that period I always find 

 you associated with my ideas. The great interest you have invariably 

 taken in the labour of this volume, entitles you to an acknowledge- 

 ment on my part; and I assure you it is with great gratification that I 

 dedicate it to you. 



Yours, 



My dear friend, 



Truly and sincerely, 



ISAAC LEA. 

 Philadelphia, July 1, 1834. 



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