UNITED STATES 



EXPLORING EXPEDITION. 



DURING THE YEARS 



1838, 1839, 1840, 1841, 1842. 



UNDEK THE COMMAND OF 



CHARLES WILKES, U. S. N. 

 VOL. XXIII. 



HYDROGRAPHY. 



BY 



CAPT. CHARLES WILKES, U. S. N., 



MEMBER OF THE AMERICAN PHILOSOPHICAL SOCIETY, ETC. 



WITH ILLUSTRATIONS. 



PHILADELPHIA: 

 PRINTED BY C. SHERMAN. 

 1861. 



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J 



