John Ross Mackay

The following is from a work lately published, Chronicles and Characters of the Stock Exchange, by John Francis:— "'The Peace of 1763,' said John Ross Mackay, Private Secretary to the Earl of Bute, and afterwards Treasurer to the Ordnance, 'was carried through and approved by pecuniary distribution.'" Will Mr. Francis, or any of your contributors, inform me where I can find the original statement?