Now the flourishing borough of Pittsburgh, situated at the confluence of the rivers Allegany and Monongahela, which form, by their junction, the commencement of the great river Ohio. This place, which is distant about thirty-five miles, eastward, from the western boundary-line of Pennsylvania, was the site of a fort, formerly erected by the French, which they called Fort Du Quesne; but on its reduction by the English, it was named by them Fort-Pitt; and by this name the place is still recognized by many people. ----- --- This arduous business of determining the territorial limits of several great states, which commenced before the American revolution, was not terminated until some years afterward. And on every occasion of that kind, where Mr. Rittenhouse’s situation, in respect to health and official duties, admitted of his being employed, his talents placed his services in requisition. He had been at home but a few weeks, after being engaged in running the Western boundary of Pennsylvania, before he was elected by Congress, together with the Rev. Dr. Ewing, and Thomas Hutchins, Esq. afterwards Geographer of the United States, a commissioner “for running a line of jurisdiction between the states of Massachusetts and New-York, conformably to the laws of the said states.” This appointment was made on the 2d day of December, 1785.[226] It was not, however, until the year 1787, that the legislature of New-York ceded to the state of Massachusetts all the lands within their jurisdiction, Westward of a meridian to be drawn from a point in the Northern boundary of Pennsylvania, eighty-two miles West from the river Delaware; excepting one mile along the Eastern side of the Niagara river; and also ten townships between the Chenengo and Owegy rivers; reserving the jurisdiction to the state of New-York: a cession which was made to satisfy a claim of Massachusetts, founded upon their original charter. ----- Footnote 226: