But the Gregory connection of Thomas Reid through his mother is, as I have said, more significant than the Reid succession. During the Civil Wars of the seventeenth century, the minister of the rural parish of Drumoak, on the north side of the Dee, between Banchory and Pitfodels, was the Rev. John Gregory, son of an Aberdeen merchant, whose father was a M’Gregor from Glenlyon. The Gregories of Deeside were thus descendants of the clan Gregor of Glenlyon and Glenstrae, a circumstance referred to by Sir Walter Scott in the Introduction to _Rob Roy_. The minister of Drumoak married a lady named Anderson, one of a family reputed for mathematical ability in successive generations. She inherited the genius of her family, and transmitted it to her sons. Her husband at Drumoak seems to have steered his cause skilfully in that troubled time, for he bought the good estate of Kinairdy, part of the heritage of the lordly house of Creighton Viscount Frendraught. Alexander, the eldest son of the Rev. John Gregory of Kinairdy, was killed by one of the Creightons in a fray in 1663, and the homicide was the occasion of a _cause célèbre_. David, the second son, succeeded his murdered brother in the lands of Kinairdy, and shared in the mathematical inheritance of the Gregories. For some reason he sold Kinairdy and became an energetic merchant, spending part of his life in Holland. This David of Kinairdy was twice married, and father of twenty-nine children, which perhaps explains the sale. The wife of the Rev. Lewis Reid of Strachan was a daughter of the second marriage. Three of her brothers were eminent Professors of Mathematics in British Universities—namely, David, first at Edinburgh, and then at Oxford, the friend of Newton; James, the successor of David in Edinburgh; and Charles, who professed mathematics at St. Andrews. David’s son was Professor of History at Oxford from 1724 till 1767, and Dean of Christ Church; and his cousin David succeeded to the chair of Mathematics at St. Andrews. Two other Professors were sons of two of ‘Kinairdy’s’ daughters—namely, our Thomas Reid, and Alexander Innes, who professed Philosophy in Marischal College. These all traced their birth to the minister of Drumoak and his mathematical wife—through their son David. But James, the third son of the Drumoak manse, was not less illustrious in himself and in his descendants. He was Professor of Mathematics, first at St. Andrews and then at Edinburgh, inventor of the reflecting telescope, also Newton’s friend and correspondent, who introduced the science of Newton into the Universities of Scotland. It is of him that Whiston writes from Cambridge:—‘He had already caused several of his students to keep acts upon several branches of the Newtonian philosophy; while we at Cambridge, poor wretches, were ignominiously studying the fictitious hypotheses of the Cartesian.’ His son James became in 1725 Professor of Medicine in King’s College, Aberdeen, a considerable local figure.