London,may 12.--A. M.
--The Privy Council met yesterday at Whitehall. Lord Hervel, the Duke of Somerset, and other ministers, were present. The Attorneys and Solicitor Generals and the Queen's Advocate attended, for the purpose of arranging a proclamation to be issued by the Queen and Council on next Tuesday, warning British subjects against illicit or overt complicity in the civil war now raging in America. The usual Saturday Cabinet Council was not held, in consequence of the above meeting.