"Then my contention collapses and she was not poisoned?"

"No, I do not say that. All I say is that expert testimony would
refute us as far as we have gone. But if you will let me make a
few tests of my own I can readily clear up that end of the case,
I now feel sure. Let me take these samples to my laboratory."

I was surprised when we ran into Inspector O'Connor waiting for
us in the corridor of the Criminal Courts Building as we left the
office of the coroner's physician. He rushed up to Kennedy and
shoved into his hand a pill-box in which six capsules rattled.
Kennedy narrowly inspected the box, opened it, and looked
thoughtfully at the six white capsules lying so innocently
within.

"One of these capsules would have been worth hundreds of
thousands of dollars to 'John,'" said Craig contemplatively, as
he shut the box and deposited it carefully in his inside vest
pocket. "I don't believe I even said good morning to you,
O'Connor," he continued. "I hope I haven't kept you waiting here
long. Have you obtained the samples of ink?"

"Yes, Professor. Here they are. As soon as you telephoned this
morning I sent my men out separately to get them. There's the ink
from the druggist, this is from the Vandam library, this is from
Farrington's room, and this is from Mrs. Popper's apartment."

"Thank you, Inspector. I don't know what I'd do without your
help," said Kennedy, eagerly taking four small vials from him.