"I had availed myself of his interest in the subject of cancer to get him to the library. It is one of my maxims never to take an avoidable risk, for which reason I made Latour apply for the books I wanted, as well as for the medical works he desired to peruse. As he was ambidextrous, I suggested the use of the two names Weltz and Rizzi, the former to be written with his right and the latter with his left hand. I was actuated in all this by two motives. First, I was manufacturing evidence which might stand me in good stead later, as well as minimising somewhat my own risk in getting the information I needed; and, secondly, I was getting Latour into a good atmosphere for my hypnotic influence. Not a word of all these matters did he relate to his daughter, whom he loves with a devotion I have never seen equalled. Indeed, it was this very affection that made my plan feasible. When I had convinced him he was a murderer I showed him Mr. Darrow's curious advertisement offering a reward, should he be assassinated, to anyone bringing about the conviction of his assailant.
"'In a year,' I said to him, 'you will die of cancer, if your crime be not previously discovered and punished. Your daughter will then be penniless. How much better for you to permit me in a few months to accuse you of the murder. You then confess; I claim and secure the reward and secretly divide with you; you are sentenced; but as considerable time will transpire between this and the date set for your execution, you in the meantime will die of cancer, leaving Jeannette well provided for.'
"I think my influence over him would have been sufficient to have compelled him to all this, could he have reasoned out no benefit accruing to himself or daughter by such a course, but with circumstances thus in my favour my task was an easy one. The public knows all it need know of what occurred after this. This man, Maitland, was in the next room to Latour's, overheard our conversation, and even phonographed our words and photographed our positions. It has always been a matter of pride with me to gracefully acknowledge that three aces are not so good as a full house, therefore I confess myself beaten, though not subdued.
"I consider this the very best tribute I can pay to the genius of the man who has undone me. I take my punishment, however, into my own hands.
"In my haste to have done with all this and to start on my long and chartless journey, I had well-nigh forgotten to tell just how I killed Mr. Darrow. No hypodermic syringe had anything to do with it. The while plan came to me while reading that fatal page upon which I left my telltale thumb-signature in my search for some feasible plan of making away with my victim. I need not go into particulars, for I know perfectly well that this Maitland knows to a nicety how the thing was done. The Daboia Russellii, or Russell's viper, is one of the best known and most deadly of Indian vipers. I procured one of these reptiles at the cost of great delay and some slight risk. That is the whole story. On the night of the murder I took the viper in a box and went down to the water-front, near the Darrow estate. Here I cut a small pole from a clump of alders, made a split in one end of it, and thrust it over the tail of the viper. It pinched him severely and held him fast despite his angry struggles to free himself and to attack anything within his reach. All that remained to be done was to thrust this through the window into the darkened room and to bring the viper within reach of Mr. Darrow. This I did, being careful to crouch so as not to obstruct the light of the window. When I heard my victim's outcry I withdrew the pole, and with it, of course, the viper, and made good my escape. That the reptile bit Mr. Darrow under the chin while his back was toward the window was mere chance, though I regarded it as a very lucky occurrence, since it seemed to render the suicide theory at first inevitable.