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It was a combination of crotalin venom and ptomaine poisons, a very deadly mess.

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.

"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."

Crotalin can be obtained now with fair ease.

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.