"I do not know where that came from, but it is evidently a part of some of my firm's advertising. The first three lines are the name and address. The last line reads, 'Keep dark'."
"I found this under the library safe."
"That is not to be wondered at. Some time ago, I remember, I got some powders for Mr. Langmore, for headaches. I remember the box had a wrapper of that sort on it. The powders lose their strength if exposed to the sunlight. And that reminds me, you—you think these murders were committed through the agency of a Chinese powder—yamlang-peholo—a powder my firm once introduced in this country."
"The evidence points that way."
"I know of nobody around that house who had any of the accursed stuff, for it certainly was accursed. I never took any there—or, at least, if I ever did, I do not remember taking it out of my grip."
"Can you furnish me with a list of people who received this stuff from you or from others?"
"I can. On my way to Sidham I made out this list, and here it is," and the young man brought it forth.
Adam Adams glanced at it quickly, and read over the long line of names and addresses—doctors, druggists and private individuals. Suddenly he paused and a smile of triumph lit up his features.
"Good!" he almost shouted.
"You have discovered something?" asked Tom Ostrello quickly.