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After all, no one knew of the use of crotalin to kill Stella Lamar except the murderer himself, and Kennedy and those of us in his confidence. The murderer might not guess that Kennedy had identified the venom. Yet if Manton were that man he had covered his feelings wonderfully in telling us about the film. My thoughts strayed to the towel upstairs.

"You see" Nagoya spoke as he finished the test he was making at the moment "without a doubt it is crotalin, the venom of the rattlesnake, Crotalus horridus." "There was no snake actually present," I hastened to explain, breaking in. Then at a glance from Kennedy I stopped, abashed, for all this had been made clear to the scientist.

"It is not necessary," Nagoya replied, turning to me with the politeness characteristic of the East. "Crotalin can be obtained now with fair ease. It is a drug used in a new treatment of epilepsy which is being tried out at many hospitals." I nodded my thanks, not wanting to interrupt again. Kennedy pressed on to the next point he wished established. "That was the spot on the portieres.

"Here," challenged Craig, facing the group and drawing from his pocket the glass ampoule, "I picked this up at the Red Lodge last night." He held it out in his hand before the Rapports so that they could not help but see it. Were they merely good actors? They betrayed nothing, at least by face or action. "It is crotalin," he announced, "the venom of the rattlesnake crotalus horridus.

It is as simple to learn how to use crotalin or botulin toxin or any number of hundreds of deadly substances as it is to obtain the majority of them. In fact, if people generally understood the ease with which whole communities could be wiped out, and grasped that it could be done so as to leave virtually no clue to the author of the horror, they might not sleep as soundly at night as they do.

Now the ampulla." "Also crotalin." Doctor Nagoya spoke positively. "How about this solution?" Kennedy took from my package the tube with the liquid made from the faint spots on the towel which I had found and which had been our first clue. "It is not crotalin." The Japanese turned to his laboratory table.

Ishi knew of the employment of these killing substances, but he did not use them. In his tribe they made a poison by teasing a rattlesnake and having it strike a piece of deer's liver. This was later buried in the ground until it rotted, and the arrow points were smeared with this revolting material. It was a combination of crotalin venom and ptomaine poisons, a very deadly mess.

If my first hypothesis had been correct, if the use of snake venom and the unlucky thirteenth scene had been largely a matter of blind chance in the selection of poison and method, then we might have expected Werner to be struck down in some dark street, or perhaps decoyed to his death at the best, inoculated with the same crotalin which had killed Miss Lamar.

It has been noticed that persons suffering from certain diseases of which epilepsy is one, after having been bitten by a rattlesnake, if they recover from the snake bite, are cured of the disease." Kennedy was forging straight ahead now in his exposure. "Crotalin," he continued, "is one of the new drugs used in the treatment of epilepsy. But it is a powerful two-edged instrument.

He used the Rapports with money to play on her mysticism by their so-called death thought, while he watched his opportunity to inject the fatal crotalin." Craig faced the criminal, whose eyes now showed more plainly than words his deranged mental condition, and in a low tone added, "The Devil is in you, Seward Blair!"