[117] Neatcattle,each....... ..... $.04 Sheep, pigs, and calves, each ........ $ .01 Ballast, per «ton ................... $ .03 And all other articles at the same rate herein before charged on the same description of im- ported articles. Provided always, that it shall be lawful at all Lease or times, for the said City Council to let the said "mm wharves, or either of them, to such person or persons, and for such rent as they shall deem proper, for any term not exceeding ten years, with full power to make such conditions, stipulations and agreements, with respect to the payment of the rent, the collecting of the wharfage and charges herein before specified, as to the manner of using of, and the repairing of, or adding to or improving the said wharves, or either of them, as the said Council shall deem advisable. 19. The person or persons leasing the said Security“, be wharves, or either of them, shall give sufficient “i““by‘e‘s‘” security, to the satisfaction of the said City Council, for the due payment of the rent, and for the performance of the covenants and conditions contained in the lease or leases of said wharf or wharves. so. The rents arising from the wharves, or either of them, so leased as aforesaid, shall form part of the feneral revenue of the city. Rent: 21. In every,case a berth shall be reserved Raaemfion for the use of the steamer or other vessel carry— ing the mails, to be selected by the Government.