Dr. J. AUGUSTINE SMITH, 



FRESIDENT OF THE COLLEGE OF PHYSICIANS AND SURGEONS, NEW YORK. 



Dear Sir : 



Knowing you have taken a greater interest in the pro- 

 motion and study of Geology than any other person in the 

 city of New York : and as your late lectures have proved 

 your high attainments in the science, I beg leave to dedi- 

 cate to you this my humble contribution. 



I am dear Sir, 



Your friend 



THE AUTHOR. 



New York, January, 1843. 



