"
If ever Craig startled me, it was by his quiet reply:
"I've isolated it in his blood, extracted it, sterilized it, and
I've tried it on myself."
In breathless amazement, with eyes riveted on him, we listened.
"Then that was what was the matter?" I blurted out. "You had been
trying the poison on YOURSELF?"
He nodded unconcernedly. "Altogether," he explained, as Leslie and
I listened, speechless, "I was able to recover from both blood
samples six centigrams of the poison. It is almost unknown. I
could only be sure of what I discovered by testing the
physiological effects. I was very careful. What else was there to
do? I couldn't ask you fellows to try it, if I was afraid."
"Good heavens!" gasped Leslie, "and alone, too."
"You wouldn't have let me do it, if I hadn't got rid of you," he
smiled quietly.
Leslie shook his head. "Tried it on the dog and made himself the
dog!" exclaimed Leslie. "I need the credit of a successful case--
but I'll not take this one."
Kennedy laughed.
"Starting with two centigrams of the stuff as a moderate dose," he
pursued, while I listened, stunned at his daring, "I injected it
into my right arm subcutaneously. Then I slowly worked my way up
to three and then four centigrams.
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