“My first feeling, as I have just said, was one of pity and horror. My second, I fear, was rather one of professional satisfaction. I made notes of my patient’s pulse and temperature, tested the rigidity of his muscles, and examined his reflexes. There was nothing markedly abnormal in any of these conditions, which harmonized with my former experiences. I had obtained good results in such cases by the inhalation of nitrite of amyl, and the present seemed an admirable opportunity of testing its virtues. The bottle was downstairs in my laboratory, so leaving my patient seated in his chair, I ran down to get it. There was some little delay in finding it⁠—five minutes, let us say⁠—and then I returned. Imagine my amazement to find the room empty and the patient gone.