Sec. 7. SUPERVISION IN LIEU OF TEACHERS' INSTITUTE. The County Board of Education may, upon the recommendation of the County Superintendent, provide for the employment of such professional supervision as may be deemed necessary, this to be in lieu of the teachers' institute as now provided by law. The County Superintendent shall be exempt after the passage of this Act from such requirements as are now provided by law for the holding of teachers' institute; and shall be empowered to provide for such meetings of the teachers of the county as may be deemed necessary and to require the attendance of all teachers upon such meetings.