Letter, from Mackintosh to Thomas Rudiman, dated at Edinburgh Discussing summer fallows in England which began in Roman times - wonders whether it continued through the centuries Read to the Royal Society on 9 April 1730 An attached note reads: 'An essay on ways and means for inclosing fallowing planting Scotland and that in sixteen years at furthest by a Lover of his Country Brigad. Mackintosh Edinburgh 1729' 10 February 1730