6. _Provision against shooting or use of firearms on the river._--From and after the passing of this Act it shall be unlawful to discharge any firearm, air-gun, gun, or similar instrument over or upon the said river within the limits aforesaid, or the banks or towpaths thereof, or any land acquired by the Conservators under the provisions of this Act, and every person discharging any firearm, air-gun, gun, or similar instrument over or upon the said river limits as aforesaid, or the banks or towpath thereof, or any such land as aforesaid, shall be deemed to have committed an offence under this Act. PART II.--REGULATION OF PLEASURE-BOATS. 7. _Registration of boats._--In addition to the rights and duties of the Conservators relating to registration and tolls already created by the Thames Navigation Act, 1870, the Thames Conservancy Act, 1878, and the Thames Act, 1883, or by any other of the Acts in the First Schedule to this Act mentioned, it shall be lawful for the Conservators to direct by by-law that all boats or vessels, with the exception of any such class of boats or vessels as may, together with the reasons of such exception, be specified in any such by-law for pleasure navigation, shall be registered, together with the true names and addresses of the owners thereof respectively, in a General Register to be kept at their chief office in a form by them to be prescribed, and as to all vessels propelled by steam power, and all house-boats, and all rowing or sailing boats plying for hire, and any such other particular class of boats or vessels as by them from time to time by by-law, may be prescribed to issue licences to ply upon any part of the upper navigation, or upon a limited part thereof only, according to regulations in each case by them to be made by by-law in manner hereinafter provided. 8. _Navigating without registration to be an offence._--From and after the dates by any such by-law to be fixed respectively, it shall be an offence under this Act to use any boat or vessel of the class mentioned in the same by-law, on any part of the river to which such by-law applies, unless such boat or vessel shall have been previously registered or licensed in manner therein provided.