The Expression “the River” in the recited Act and this Act shall mean and include the RiverTweed, and every River, Brook, or Stream which flows or runs into the said River, and also the Mouth or Entrance of the said River, as described and defined in this Act; and the several other Words and Expressions interpreted in the Second Section of the recited Act shall, when used in this Act, have the same Meanings as are by the recited Act assigned to them respectively.