Show origin orgin of the th morn book bock the horn book in 1450 and used considerably up to t the lie close of the eighteenth cen century 4 jury was the usual text book of the elementary tle schools A thin slab blab of 0 hard was waa covered with parchment on onh thich ich were printed the capital ands and small letters numerals and some elementary elp syllables sylla blea and words ardi oer cher this a thin sheet ot of transparent cows horn was us placed and nd firmly bound fid att that no moisture could penetrate |