He took the toy, promised to subject it to every test possible and let me know the result. Then I went home. I felt ill, or imagined that I did, which under the circumstances was almost as bad.

Next day, however, I was quite well, with the exception of a certain inconvenience in my thumb. But not till the following week did I receive the chemist’s report. It overthrew my whole theory. He had found nothing, and returned me the bit of steel.

But I was not convinced.

“I will hunt up this John Graham,” thought I, “and study him.”

But this was not so easy a task as it may appear. As Mrs. Holmes possessed no clue to the whereabouts of her quondam lover, I had nothing to aid me in my search for him, save her rather vague description of his personal appearance and the fact that he was constantly interrupted in speaking by a low, choking cough. However, my natural perseverance carried me through. After seeing and interviewing a dozen John Grahams without result, I at last lit upon a man of that name who presented a figure of such vivid unrest and showed such desperate hatred of his fellows, that I began to entertain hopes of his being the person I was in search of. But determined to be sure of this before proceeding further, I confided my suspicions to Mrs. Holmes, and induced her to accompany me down to a certain spot on the “Elevated” from which I had more than once seen this man go by to his usual lounging place in Printing-house Square.

She showed great courage in doing this, for she had such a dread of him that she was in a state of nervous excitement from the moment she left her house, feeling sure that she would attract his attention and thus risk a disagreeable encounter. But she might have spared herself these fears. He did not even glance up in passing us, and it was mainly by his walk she recognized him. But she did recognize him; and this nerved me at once to set about the formidable task of fixing upon him a crime which was not even admitted as a fact by the authorities.

He was a man-about-town, living, to all appearance, by his wits. He was to be seen mostly in the downtown portions of the city, standing for hours in front of some newspaper office, gnawing at his finger-ends, and staring at the passers-by with a hungry look that alarmed the timid and provoked alms from the benevolent. Needless to say that he rejected the latter expression of sympathy, with angry contempt.

His face was long and pallid, his cheek-bones high and his mouth bitter and resolute in expression. He wore neither beard nor mustache, but made up for their lack by an abundance of light brown hair, which hung very nearly to his shoulders. He stooped in standing, but as soon as he moved, showed decision and a certain sort of pride which caused him to hold his head high and his body more than usually erect. With all these good points his appearance was decidedly sinister, and I did not wonder that Mrs. Holmes feared him.

My next move was to accost him. Pausing before the doorway in which he stood, I addressed him some trivial question. He answered me with sufficient politeness, but with a grudging attention which betrayed the hold which his own thoughts had upon him. He coughed while speaking and his eye, which for a moment rested on mine, produced upon me an impression for which I was hardly prepared, great as was my prejudice against him. There was such an icy composure in it; the composure of an envenomed nature conscious of its superiority to all surprise. As I lingered to study him more closely, the many dangerous qualities of the man became more and more apparent to me; and convinced that to proceed further without deep and careful thought, would be to court failure where triumph would set me up for life, I gave up all present attempt at enlisting him in conversation, and went my way in an inquiring and serious mood.

In fact, my position was a peculiar one, and the problem I had set for myself one of unusual difficulty. Only by means of some extraordinary device such as is seldom resorted to by the police of this or any other nation, could I hope to arrive at the secret of this man’s conduct, and triumph in a matter which to all appearance was beyond human penetration.