Nant 
ge na eo a 
7 OR: 
TO HIS EXCELLENCY 
JOSEPH CORREA DE SERRA, 
FELLOW OF THE ROYAL SOCIETY, OF THE NATIONAL Ine 
STETUTE OF FRANGE, &c., &C. AND MINISTER OF 
H. M. F. M. oF PoRTUGAL, BRAZIL AND AL- 
GARVES, TO THE UNITED STATES, 
SIR, ef 
"The active interest which you have ever 
taken in the promotion of Natural Science, bo 
in Europe and America, and your desire toe 
vate it to the rank of Philosophy, demand 
the gratitude of all its votaries, and inspires tl 
feéble acknowledgments of your humble “ 
vant, the 
AUTHOR. 
