Whenever the county superintendent of schools assumes responsibility for the establishment of a library or the performance of library services pursuant to this article, the county superintendent shall, on or before August 31st, in each year, report to the State Department of Education on the condition of the libraries under his supervision, for the year ending June 30th preceding. The reports of the superintendent shall, in addition to other matters deemed expedient by the librarian and the superintendent, contain such statistical and other information as is deemed desirable by the State Department of Education. For this purpose the State Department of Education may send to the several county superintendents or librarians instructions or question blanks so as to obtain the material for a comparative study of library conditions in the state.