These instances of genius in three families, afford striking examples of its being sometimes hereditary. It is further observable, that, in the case of the great professor Simson, his mathematical endowments were said to be derived from his mother’s family; as Mr. Rittenhouse’s were likewise supposed to have been from that of his mother. ----- A casualty that occurred in the year 1756, appeared to have been very near depriving the world of the talents, services, and example of our Philosopher, at a very early period of those pursuits in which he was afterwards so eagerly engaged. This circumstance is thus narrated by himself, in a letter dated the 26th of July, in that year, and addressed to the Rev. Mr. Barton, at his then residence in Redding township, York county.[77] ----- Footnote 77: Mr. Barton resided on a farm, near what are called the Sulphur Springs (now comprehended within the limits of the new county of Adams,) from some time in the year 1755, until the spring of 1759; during which period he officiated as a missionary from “the society,” established in England, “for the propagation of the gospel in foreign parts,” for the counties of York and Cumberland. While he resided in that then remote settlement of Pennsylvania, he was greatly instrumental, both by his precept and example, in stimulating the people to avenge the numerous barbarities perpetrated on the inhabitants and their property in that frontier, by their French and Indian enemies. In the expedition against Fort Du Quesne (now Pittsburg,) undertaken in the year 1758, under the orders of brigadier-general Forbes, he served as a chaplain to the forces then employed, by virtue of a commission from governor Denny: and in that campaign he became personally acquainted not only with the commander in chief, but, among others, with colonel (afterwards general) Washington; colonel (afterwards general) Mercer; colonel Byrd of Virginia; colonel Dagworthy; colonel James Burd of Pennsylvania; all provincial officers of great merit; besides colonel (afterwards general) Bouquet, sir John St. Clair, sir Peter Hacket, major Stewart, and other gentlemen of worth and distinction, who held commands in the British regiments engaged in that service. With most of these very respectable military characters Mr. Barton occasionally corresponded, afterward; and his services, during a residence of between three and four years in that part of Pennsylvania, were honourably acknowledged, as well in England as among his fellow-citizens, in various instances. After Mr. Barton left the county of York, he became established in Lancaster, where he officiated as rector of St. James’s church in that borough, and missionary to the large and respectable country-congregations of Caernarvon and Pequea, nearly twenty years. -----