Again the cackling giggle, which made the girl try to draw still nearer to her lover, as if the thing were possible.
"Some time before I had come into possession of quite a quantity of potassium cyanide; I won't say how--I had. The artfulness of lunatics is proverbial, and I'm as artful as any of them; on that point I refer you to Metcalf, as well as to others who have had me in their charge, both in asylums and out of them--they'll tell you! It was in the form of tabloids, looking just like sweeties, in a nice little silver box; enough to kill a street. I had meant to use it to kill myself, but at the sight of that dreadful man, with his bulging mouth, I thought--why not use it to kill him? Pop one into his mouth, and the trick was done! I moved inch by inch and foot by foot along the seat towards his end of the carriage; he still snored on, paying no attention of any sort to me; he was a horrid, vulgar man. At last I was right in front of him; I might have been ten miles away for all he knew. How he snored, and how his jaws did gape! I had the silver box in one hand and a tabloid between the finger and thumb of the other, and I leaned forward and popped it into his open mouth."
Mr. Parker illustrated his words by his gestures, with the air of one who was telling an amusing tale.
"Oh, what a change came over him! You should have seen it! He snored the tabloid right down his throat, and he gave a great gasp and was dead. He had not even waked; I am sure that he never knew I was on the seat in front of him, or that I was in the carriage at all. There was his huge carcase bolt upright in front of me, and I knew that he would never snore any more. It made me feel quite odd; it was all so sudden and so funny. I daresay it would have made that extraordinary young man feel odd, eh?"
He looked up at Rodney with a leer which made his mean, wrinkled face all at once seem bestial. But he never faltered in his story, which he told with a sniggering relish which lent it a quality of horror which no display of dramatic, conscience-stricken intensity could possibly have done.
"My idea had been to tell the porters all about it the first time the train stopped; it would have been funny to see the fuss they'd have made; I shouldn't have cared. But it so happened that the signal was against us, and the train stopped in the middle of Redhill tunnel."
The inspector allowed no hint to escape him of what he knew or did not know. He kept his eyes fastened on the little man, as if his wish were not so much to follow his actual words, but to see something which might be behind them.
"When it stopped I had another idea, quite as brilliant as the first. Why should I go through the nuisance of a trial for murder? With a little management, if this objectionable person were found in a carriage by himself, it might be taken for granted that he had committed suicide, which would be too funny. So I put the silver box open in his fingers, slipped out of the carriage into the tunnel--in the darkness no one saw me--waited for the train to go, then walked after it, out of the tunnel, up the banks, across the fields to Redhill Station; had a drink or two, which I was in want of; went on by the 10.40, until at Croydon I was joined by Metcalf, who had got there first. For the rest of the tale refer to him."
Continuing, Mr. Parker seemed to address his remarks particularly to Rodney:
"You never would have thought that it could be so easy to kill a man, and have it brought in as suicide, would you? When I read the report of the inquest in the papers, I was amazed to find how easy it really was. Then it occurred to me that as, of course, he had been murdered--I knew that--why shouldn't I communicate with the police, after all? No harm would come to me; lunatics are protected by the law. It would be different if he had been murdered by--you; you would quite certainly be hung. I shall go to Broadmoor. I have rather a fancy for Broadmoor. I am told that they are all of them lunatics there; I should like to see. At any rate, they have all of them done something; no lunatic I've met ever did anything worth doing. They must be interesting people. But certain credentials are necessary for Broadmoor, and now I think I've earned them. If the part I've played in this little affair of Graham Patterson doesn't qualify me for Broadmoor, then I should very much like to know what would. Eh, young man, eh?"