The trustees, officers or persons in charge of all literary, scientific or professional institutions of learning incorporated, supported or aided by the State and of all schools or private educational institutions shall, on or before the fifteenth day of July in each year, make a report in writing to the State Superintendent of Education of such statistics as the Superintendent shall prescribe relating to the number of pupils and instructors, courses of study, cost of tuition and the general condition of the institution or school under their charge. The Superintendent shall prepare blank forms of inquiry for such statistics and shall send the same to every such institution or school on or before the tenth day of May in each year. So much of such information as he may deem proper shall be incorporated in his annual report.