As of July 7, 1927, the corporate limits of the Sanitary District of Chicago are hereby extended so as to embrace and include within the same, the territory and tracts of land situated in the County of Cook and State of Illinois, hereinafter described as follows:
     Beginning at a point four hundred feet (400 ft.) east of the northwest corner of the southwest quarter (S. W. 1/4) of the northeast quarter (N. E. 1/4) of Section Seven (7), Township thirty-eight (38) North, Range Twelve (12) east; thence east along the east and west center line of the north half (N1/2) of said Section Seven (7) to the east line of said Section Seven (7); thence south along the east line of said Section Seven (7) to the southeast corner of said Section Seven (7); thence west along the south line of said Section Seven (7) to a point four hundred (400 ft.) feet east of the north and south center line of said Section Seven (7) thence north along a line parallel to and four hundred (400 ft.) feet east of the north and south center line of said Section Seven (7) to the point of beginning.