Case 1, a coal-miner aged 50, came to hospital on November 1, 1956. He had been struck across the bridge of the nose by a wire rope 3 weeks earlier, but the injury was trivial and he had continued to work. After a few days he noted that the sight of his left eye was dim and misty. His right eye became affected 2 weeks before admission. He noted that if he looked straight ahead his vision was adequate, but he could not see clearly to either side. During this period of 8 weeks he had dull occipital headaches, and, on being questioned, he said that he had suffered from headaches over the vertex of the skull for a year. He had attributed them to drinking, * Short paper read to M.S.S