...graduate on district •t«i. account in any of said normal schools, shall be liable to devote trict which defrayed the expense of their professional instruction,...some other district or districts at such salary as may be given therein; and each of said students before admission to the proper normal school, shall...

...the graduation to the exercise of their profession as Teachers in the Common Schools of the District which defrayed the expense of their professional instruction,...compensation paid in such Districts; and if not so n quired by their proper District, they shall devote said three years to the employment of teaching...

...exercise of their profession as teachers in the common schools of the district yjte "iJree years" to which defrayed the expense of their professional instruction, if so required by the teaching in' public respective boards of directors of such districts, and at the medium salary or com-...