233.38  Exchange of textbooks.--To effectuate economical and expeditious distribution of textbooks to the several districts of the state for use in the public schools, the Department of Education is directed to arrange for exchange of books among the several districts in accordance with their respective needs, and to that end, the superintendents in the several districts shall, upon direction from the department, crate and ship such books as shall be designated to such districts in the state as the department may determine, and the department may, when it deems advisable, direct surplus books in any district to be shipped to some central point to be designated by it to be held or distributed as the need therefor shall arise.