Describes JH's day at Mint and at home. Reading H. V. Regnault's 'Chemistry.' Met with Richard Grenville about 'miserably knotty affair' with Benedetto Pistrucci. Inspected [W. A.] Miller's improved assay process at R.S.L. Arranged with Sir [Charles] Fremantle to employ twenty Custom House clerks at Mint temporarily. Arranged lease of refinery to Rothschild. Too busy to join daughters and Miss Stewart for dinner and opera. Dined at Duke of Somerset's with Charles Babbage, [Holland?], and David Brewster.