III. JAMES MACKENZIE, N.P., who, on the 14th of March, 1709, married Marion, third daughter of Thomas Traill of Tirlet, with issue--

1. Thomas, merchant in Kirkwall, afterwards of Groundwater.

2. Murdoch Mackenzie, of Minehead, Somersetshire, Hydropapher to the Navy, and described in one of the Gairloch MSS., written by James Mackenzie, a member of this family, as "Navigator to His Majesty, known by his accurate surveys of the western coast of Great Britain and Ireland, and whose abilities will render him famous to posterity." He went round the world with Captain Cook's second expedition in 1772, died unmarried in London, and is buried at Oxford.

3. James, S.S.C., described in one of the Gairloch MSS. as "once in the service of the Earl of Morton," in the Orkneys, author of a treatise on "The General Grievances and Oppressions of the Isles of Orkney and Shetland," and of another on Security. He was himself the author of this Gairloch MS. He died unmarried in London about 1733.

IV. THOMAS MACKENZIE of Groundwater, who married Elizabeth, daughter of the Rev. William Blaw, Westray, with issue--

1. Murdoch, his heir and successor.

2. Kenneth, who succeeded his brother Murdoch.

3. Mary, married Thomas Balfour of Huip, with issue.