We learn from undoubted authority, that Lord Dartmouth, Secretary of State, has wrote a Circular Letter to the Governors upon this Continent, informing them that his Majesty has thought fit by his Order in Council, dated the 19th of October, to prohibit the Exportation from Great Britain of Gun-Powder or any sort of Arms and Ammunition; and has signified to them his Majesty's Command that they do take the most effectual Measures for arresting, detaining and securing any Gun Powder, or any sort of Arms or Ammunition, which may be attempted to be imported into the Province over which they respectively preside, unless the Master of the Ship having such Military Stores on board, shall produce a Licence from his Majesty or the Privy Council for the Exportation of the same from some of the Ports of Great-Britain.