In a Cause on an Action Brought by The Rt. Hon. Richard Lord Grosvenor Against His Royal Highness Henry Frederick Duke of Cumberland; For Criminal Conversation with Lady Grosvenor. Tried Before The Right Hon. William Lord Mansfield, In the Court of King's-Bench, On the 5th of July, 1770. Containing the Evidence Verbatim as Delivered by the Witnesses; with All the Speeches and Arguments of the Counsel and of the Court. Faithfully Taken in Short Hand by a Barrister