§ 336. Canal boats exempt from enrollment, license, and customs fees
The act to which this is a supplement shall not be so construed as to extend the provisions of the said act to canal boats or boats employed on the internal waters or canals of any State; and all such boats, excepting only such as are provided with sails or propelling machinery of their own adapted to lake or coastwise navigation, and excepting such as are employed in trade with the Canadas, shall be exempt from the provisions of the said act, and from the payment of all customs and other fees under any act of Congress.