24 Pa. Stat. § 1771
When any number of citizens of this state, not less than thirteen, shall, as contributors or stockholders, erect and establish a school for the professional training of young men and women as teachers for the common schools of the state, in accordance with the provisions of this act, such school may become entitled to its benefits, in the manner hereinafter set forth: Provided, however, That not more than one such school shall, at the same time, become and continue to be entitled to such benefits in each of the foregoing normal school districts; and that this act shall not take effect till at least four such schools, in as many different districts, shall have complied and been recognized in accordance with the provisions of this act.
24 P.S. § 1771