The triumph of cio-root came as recently as yesterday. Montgomery, his wife, and myself, had arranged to go into Glasgow for the day. I called for them in the forenoon and had to wait, as Montgomery had gone along to the office to see if there were any letters. He arrived soon after me, saying that he had a headache, but saying it in a cheery way, for he knew that the root was in the next room. He disappeared into the library to nibble half an inch of the cio-root, and shortly afterwards we set off. The headache had been dispelled as usual. In the train he and I had another argument about the one great drug, and he ridiculed my notion about its being faith that drove his headache away. I may hurry over the next two hours, up to the time when we wandered into Buchanan street. There Montgomery met a friend, to whom he introduced me. The gentleman was in a hurry, so we only spoke for a moment, but after he had left us he turned back. "Montgomery," he said, "do you remember that day I met you in Chambers street, Edinburgh?" "I have good reason for remembering the occasion," said Montgomery, meaning to begin the story of his wonderful cure; but his friend who had to catch a 'bus, cut him short. "I told you at that time," he said, "about a new drug called the cio-root, which had a great reputation for curing headaches." "Yes," said Montgomery; "I always wanted to thank you----" His friend, however, broke in again-- "I have been troubled in my mind since then," he said, "because I was told afterwards that I had made a mistake about the proper dose. If you try the cio-root, don't take half an inch, as I recommended, but quarter of an inch. Don't forget. It is of vital importance." Then he jumped into his 'bus, but I called after him, "What would be the effect of half an inch?" "Certain death!" he shouted back, and was gone. I turned to look at Montgomery and his wife. She let her umbrella fall and he had turned white. "Of course, there is nothing to be alarmed about," I said, in a reassuring way. "Montgomery has taken half an inch scores of times; you say it always cured you." "Yes, yes," Montgomery answered; but his voice sounded hollow.