"I've
isolated it in their blood, extracted it, sterilised it, and I've
tried it on myself."
In breathless amazement, with eyes riveted on Craig, we listened.
"Altogether I was able to recover from the blood samples of both
of the victims of this crime six centigrams of the poison," he
pursued. "Starting with two centigrams of it as a moderate dose,
I injected it into my right arm subcutaneously. Then I slowly
worked my way up to three and then four centigrams. They did not
produce any very appreciable results other than to cause some
dizziness, slight vertigo, a considerable degree of lassitude,
and an extremely painful headache of rather unusual duration. But
five centigrams considerably improved on this. It caused a degree
of vertigo and lassitude that was most distressing, and six
centigrams, the whole amount which I had recovered from the
samples of blood, gave me the fright of my life right here in
this laboratory this afternoon.
"Perhaps I was not wise in giving myself so large an injection on
a day when I was overheated and below par otherwise because of
the strain I have been under in handling this case. However that
may be, the added centigram produced so much more on top of the
five centigrams previously taken that for a time I had reason to
fear that that additional centigram was just the amount needed to
bring my experiments to a permanent close.
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