Charles Maclay, the elder immigrant brother, died in 1753. His wife, Eleanore, whom he had married in Ireland, died in 1789. To them were born four sons and one daughter: John, born in Ireland, 1734, for many years a magistrate, and in 1776 he was a delegate to convention in Carpenters’ Hall, Philadelphia. He also served in the General Assembly, 1790–1792 and 1794; William, born in Chester County, July 20, 1737, whose sketch appears in another story; Charles, also born in Chester County, in 1739, was a soldier of the Revolution, died in 1834 at Maclays Mills; Samuel, the subject of our sketch, was born June 17, 1741. Samuel Maclay was educated in the classical school conducted by Dr. J. Allison, of Middle Spring. He also mastered the science of surveying, which he followed for years. In 1769 he was engaged with his brother William and Surveyor General Lukens in surveying the officers’ tracts on the West Branch of the Susquehanna, which had been awarded to the officers of First Battalion in Bouquet’s expedition. A coincident fact is that the remains of this distinguished patriot lie buried on the allotment awarded Captain John Brady, who drew the third choice, and which was surveyed for him by Maclay. Samuel Maclay, November 10, 1773, married Elizabeth, daughter of Colonel William Plunket, then President Judge of Northumberland County, and commandant of the garrison at Fort Augusta. They took up their residence on the Brady tract in Buffalo Valley. To this union six sons and three daughters were born. From the moment Samuel Maclay became a resident of what is now Union County until his death he was identified with the important history of the valley. Samuel Maclay was one of the commissioners to survey the headwaters of the Schuylkill, Susquehanna and Allegheny Rivers. The others were Timothy Matlack, of Philadelphia, and John Adlum, of York. They were commissioned April 9, 1789. These eminent men were skilled hydrographical and topographical engineers and completed the first great survey of Pennsylvania. The journal kept by Maclay is interesting and valuable and relates many thrilling experiences quite foreign to those of present-day surveyors. He was lieutenant colonel of the First Battalion, Northumberland County Militia, organized at Derr’s Mills, now Lewisburg, September 12, 1775. In 1787 Samuel Maclay was elected to Pennsylvania Assembly and served until 1791, when he became Associate Justice of Northumberland County. In 1794 he was elected to Congress. Three years later he was elected to Pennsylvania Senate, where he served six years. He was elected Speaker in 1802 and he served in this capacity until March 16, 1802, when he took his seat in the United States Senate, where he continued until January 4, 1809, resigning on account of broken health. He died October 5, 1811, at the age of seventy years. His wife, Elizabeth Plunket Maclay, survived her distinguished husband until 1835. ----------