“…The polarographic behavior of quiñones and hydroquinones continues to be used to test new' techniques, solvents, and electrodes in polarography. Data are given for the reduction of benzoquinone at the rotating dropping mercury electrode (543), the oxidation of hydroquinone and other compounds at the graphite electrode (199), the adsorption of hydroquinone, metal entechóles, and various anilines at the dropping mercury electrode (267), and the oxidation of hydroquinone using chronopotentiometry at platinum and gold W'ire electrodes (582).…”