No More Learning

Seeing him in a very
"good humour, I took that           of telling him, 'That
"as General Grumkow had denied his having held a Secret
"Correspondence with Eeichenbach, or having written the
"Letters I had some time ago delivered to his Majesty, I
"was now ordered by the King my Master to put into his hands
"an Original Letter of General Grumkow'" --
-- Where is that Original Letter?