Section 8. The first section of an act of assembly, approved the fourteenth day of April, Anno Domini one thousand eight hundred and sixty-eight, entitled "A supplement to an act, entitled 'An act appropriating ground for public purposes in the city of Philadelphia,' approved the twenty-sixth day of March, Anno Domini one thousand eight hundred and sixty-seven," shall be amended so that the same, in describing the boundaries of Fairmount park, shall read as follows: "Beginning at a point to the north-easterly line of property owned and occupied by the Reading Railroad Company, near the city bridge over the river Schuylkill, at the falls, where said north-easterly line would be intersected by the line dividing the property of H. Duhring from that of F. Stoever and T. Johnson, if the same were extended from thence in a south-westerly direction upon said dividing line, and it prolongation to the middle of the Ford road," and from thence the said boundary line shall proceed as in said first section is described; and furthermore, it is hereby declared to be the true intent and meaning of the fifth section of said act, that all the grounds pertaining to Fairmount park, and mentioned described in any of the sections of said act of assembly, shall be subject to all the powers, control and authority which is by force of law conferred upon the commissioners of Fairmount park.