TO HIS EXCELLENCY 



JOSEPH CORREA DE SERRA, 



FELLOW OF THE ROYAL SOCIETY, OF THE >IATIONAL IN- 

 STITUTE OF FRANCE, &C., &C. AXD MINISTER OF 

 H. M. F. M. OF PORTUGAL, BRAZIL AND AL- 

 GARVES, TO THE UNITED STATES. 



SIR, 



The active interest which you have ever 

 taken in the promotion of Natural Science, both 

 in Europe and America, and your desire to ele- 

 vate it to the rank of Philosophy, demands 

 the gratitude of all its votaries, and inspires the 

 feeble acknowledgments of your humble ser- 

 vant, the 



AUTHOR. 



