The said boundary line, so as aforesaid run, marked and returned, by the said Andrew Ellicot, commissioner on the part of this state, and the said James Clinton and Simeon Dewitt, commissioners on the part of the state of New York, beginning at the first mentioned corner stone, planted in the said small island, in the Mohawk or west branch of Delaware river, and thence extending due west, by the marked stones aforesaid, so far westward as to meet the meridian line, which is hereafter to be fixed and established as the western boundary of the state of New York, shall be, and for ever hereafter shall be deemed and taken to be, and is hereby declared to be, the true and just line of boundary and partition, both of territory and jurisdiction, between the state of Pennsylvania and the state of New York; and that this commonwealth of Pennsylvania doth not, nor at any time hereafter shall or will, claim to have, hold or exercise, any right, power or jurisdiction, in or over the soil or inhabitants dwelling northward of the said line hereby established, eastward of the said meridian line, or western boundary of New York: Provided always nevertheless, That nothing in this act contained shall be deemed to bind the commonwealth of Pennsylvania, until the legislature of New York shall establish and confirm the said boundary line on their part, as fully and effectually as the same is by this act established and confirmed.