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"That is why I have done it," said he.
It showed the bust and face of a very beautiful woman. Holmes stooped over it.
"Brenda Tregennis," said he.
"Yes, Brenda Tregennis," repeated our visitor. "For years I have loved her. For years she has loved me. There is the secret of that Cornish seclusion which people have marvelled at. It has brought me close to the one thing on earth that was dear to me. I could not marry her, for I have a wife who has left me for years and yet whom, by the deplorable laws of England, I could not divorce. For years Brenda waited. For years I waited. And this is what we have waited for." A terrible sob shook his great frame, and he clutched his throat under his brindled beard. Then with an effort he mastered himself and spoke on:
"The vicar knew. He was in our confidence. He would tell you that she was an angel upon earth. That was why he telegraphed to me and I returned. What was my baggage or Africa to me when I learned that such a fate had come upon my darling? There you have the missing clue to my action, Mr. Holmes."
"Proceed," said my friend.
Dr. Sterndale drew from his pocket a paper packet and laid it upon the table. On the outside was written "Radix pedis diaboli" with a red poison label beneath it. He pushed it towards me. "I understand that you are a doctor, sir. Have you ever heard of this preparation?"
"Devil's-foot root! No, I have never heard of it."
"It is no reflection upon your professional knowledge," said he, "for I believe that, save for one sample in a laboratory at Buda, there is no other specimen in Europe. It has not yet found its way either into the pharmacopoeia or into the literature of toxicology. The root is shaped like a foot, half human, half goatlike; hence the fanciful name given by a botanical missionary. It is used as an ordeal poison by the medicine-men in certain districts of West Africa and is kept as a secret among them. This particular specimen I obtained under very extraordinary circumstances in the Ubangi country." He opened the paper as he spoke and disclosed a heap of reddish-brown, snuff-like powder.
"Well, sir?" asked Holmes sternly.
"I am about to tell you, Mr. Holmes, all that actually occurred, for you already know so much that it is clearly to my interest that you should know all. I have already explained the relationship in which I stood to the Tregennis family. For the sake of the sister I was friendly with the brothers. There was a family quarrel about money which estranged this man Mortimer, but it was supposed to be made up, and I afterwards met him as I did the others. He was a sly, subtle, scheming man, and several things arose which gave me a suspicion of him, but I had no cause for any positive quarrel.
"One day, only a couple of weeks ago, he came down to my cottage and I showed him some of my African curiosities. Among other things I exhibited this powder, and I told him of its strange properties, how it stimulates those brain centres which control the emotion of fear, and how either madness or death is the fate of the unhappy native who is subjected to the ordeal by the priest of his tribe. I told him also how powerless European science would be to detect it. How he took it I cannot say, for I never left the room, but there is no doubt that it was then, while I was opening cabinets and stooping to boxes, that he managed to abstract some of the devil's-foot root. I well remember how he plied me with questions as to the amount and the time that was needed for its effect, but I little dreamed that he could have a personal reason for asking.
"I thought no more of the matter until the vicar's telegram reached me at Plymouth. This villain had thought that I would be at sea before the news could reach me, and that I should be lost for years in Africa. But I returned at once. Of course, I could not listen to the details without feeling assured that my poison had been used. I came round to see you on the chance that some other explanation had suggested itself to you. But there could be none. I was convinced that Mortimer Tregennis was the murderer; that for the sake of money, and with the idea, perhaps, that if the other members of his family were all insane he would be the sole guardian of their joint property, he had used the devil's-foot powder upon them, driven two of them out of their senses, and killed his sister Brenda, the one human being whom I have ever loved or who has ever loved me. There was his crime; what was to be his punishment?
"Should I appeal to the law? Where were my proofs? I knew that the facts were true, but could I help to make a jury of countrymen believe so fantastic a story? I might or I might not. But I could not afford to fail. My soul cried out for revenge. I have said to you once before, Mr. Holmes, that I have spent much of my life outside the law, and that I have come at last to be a law to myself. So it was even now. I determined that the fate which he had given to others should be shared by himself. Either that or I would do justice upon him with my own hand. In all England there can be no man who sets less value upon his own life than I do at the present moment.
"Now I have told you all. You have yourself supplied the rest. I did, as you say, after a restless night, set off early from my cottage. I foresaw the difficulty of arousing him, so I gathered some gravel from the pile which you have mentioned, and I used it to throw up to his window. He came down and admitted me through the window of the sitting-room. I laid his offence before him. I told him that I had come both as judge and executioner. The wretch sank into a chair, paralyzed at the sight of my revolver. I lit the lamp, put the powder above it, and stood outside the window, ready to carry out my threat to shoot him should he try to leave the room. In five minutes he died. My God! how he died! But my heart was flint, for he endured nothing which my innocent darling had not felt before him. There is my story, Mr. Holmes. Perhaps, if you loved a woman, you would have done as much yourself. At any rate, I am in your hands. You can take what steps you like. As I have already said, there is no man living who can fear death less than I do."
Holmes sat for some little time in silence.
"What were your plans?" he asked at last.
"I had intended to bury myself in central Africa. My work there is but half finished."
"Go and do the other half," said Holmes. "I, at least, am not prepared to prevent you."
Dr. Sterndale raised his giant figure, bowed gravely, and walked from the arbour. Holmes lit his pipe and handed me his pouch.
"Some fumes which are not poisonous would be a welcome change," said he. "I think you must agree, Watson, that it is not a case in which we are called upon to interfere. Our investigation has been independent, and our action shall be so also. You would not denounce the man?"
"Certainly not," I answered.
"I have never loved, Watson, but if I did and if the woman I loved had met such an end, I might act even as our lawless lion-hunter has done. Who knows? Well, Watson, I will not offend your intelligence by explaining what is obvious. The gravel upon the window-sill was, of course, the starting-point of my research. It was unlike anything in the vicarage garden. Only when my attention had been drawn to Dr. Sterndale and his cottage did I find its counterpart. The lamp shining in broad daylight and the remains of powder upon the shield were successive links in a fairly obvious chain. And now, my dear Watson, I think we may dismiss the matter from our mind and go back with a clear conscience to the study of those Chaldean roots which are surely to be traced in the Cornish branch of the great Celtic speech."
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