post-mortem. And the result? That, I will confess, did astonish me considerably; it was the triumph of the unexpected. The two doctors who made the autopsy were obliged to confess that they could not discover the faintest trace of any kind of foul play; their most exquisite tests and reagents failed to detect the presence of poison in the most infinitesimal quantity. Death, they found, had been caused by a somewhat obscure and scientifically interesting form of brain disease. The tissue of the brain and the molecules of the grey matter had undergone a most extraordinary series of changes; and the younger of the two doctors, who has some reputation, I believe, as a specialist in brain trouble, made some remarks in giving his evidence which struck me deeply at the time, though I did not then grasp their full significance. He said: "At the commencement of the examination I was astonished to find appearances of a character entirely new to me, notwithstanding my somewhat large experience. I need not specify these appearances at present, it will be sufficient for me to state that as I proceeded in my task I could scarcely believe that the brain before me was that of a human being at all." There was some surprise at this statement, as you may imagine, and the coroner asked the doctor if he meant to say that the brain resembled that of an animal. "No," he replied, "I should not put it in that way. Some of the appearances I noticed seemed to point in that direction, but others, and these were the more surprising, indicated a nervous organization of a wholly different character from that either of man or the lower animals." It was a curious thing to say, but of course the jury brought in a verdict of death from natural causes, and, so far as the public was concerned, the case came to an end. But after I had read what the doctor said I made up my mind that I should like to know a good deal more, and I set to work on what seemed likely to prove an interesting investigation. I had really a good deal of trouble, but I was successful in a measure. Though why—my dear fellow, I had no notion at the time. Are you aware that we have been here nearly four hours? The waiters are staring at us. Let's have the bill and be gone.'