"... after duly examining and weighing the advantages and disadvantages of the several situations within the limits aforesaid, I do hereby declare and make known that the location of one part of the said district of 10 miles square shall be found by running four lines of experiment in the following manner, that is to say: Running from the court-house of Alexandria, in Virginia, due southwest half a mile, and thence a due southeast course till it shall strike Hunting Creek, to fix the beginning of the said four lines of experiment. "Then beginning the first of the said four lines of experiment at the point on Hunting Creek where the said southeast course shall have struck the same, and running to the said first line due northwest 10 miles; thence the second line into Maryland due northeast 10 miles; thence the third line due southeast 10 miles, and thence the fourth line due southwest 10 miles to the beginning on Hunting Creek." Since the tract thus specified did not lie within the limits set by the Act of July 1790, the Congress was asked to authorize the moving of the southern boundary point of the "ten miles square" farther south to include the Eastern Branch and the town of Alexandria. Accordingly, the Act of July 16, 1790, was amended by an Act approved March 3, 1791: "... it shall be lawful for the President to make any part of the territory below the said limit [the confluence of the Eastern Branch with the Potomac] and above the mouth of Hunting Creek, a part of said district, so as to include a convenient part of the Eastern Branch, and of the lands lying on the lower side thereof and also the town of Alexandria...." No time was lost in establishing definite boundaries for the new district, and on March 30, 1791, President Washington issued a proclamation declaring "that the whole of the said territory shall be located and included within the four lines following, that is to say: "Beginning at Jones's Point, being the upper cape of Hunting Creek, in Virginia, and at an angle in the outset of 45 degrees west of the north, and running in a direct line 10 miles for the first line; then beginning again at the same Jones's Point and running another direct line at a right angle with the first across the Potomac 10 miles for the second line; then from the termination of the said first and second lines running two other direct lines of 10 miles each, the one crossing the Eastern Branch aforesaid and the other the Potomac, and meeting each other in a point. "... and the territory so to be located, defined, and limited shall be the whole territory accepted by the said acts of Congress as the district for the permanent seat of the Government of the United States."[25] [25] Richardson, _Messages and Papers of the Presidents_, Vol. I, p. 102.