analogy?"

"Do you mean us to believe poor old Moseley a cold-blooded murderer?"
demanded Mr. Curtis Fleming.

"Far from it. At worst an unhappy victim of his own carelessness in
loosing a peril upon his neighborhood. You're forgetting a
connecting link; the secretive red-dot communications from New York
City addressed by Moseley to himself on behalf of some customer who
ordered simply by a code of ink dots. He was the man I had to find.
The giant luna moths helped to do it."

"I don't see where they come in at all," declared Dorr bluntly. "A
moth a foot wide couldn't crawl through a keyhole."

"No; nor do any damage if it did. The luna is as harmless as it is
lovely. In this case the moths weren't active agents. They were
important only as clues--and bait. Their enormous size showed
Professor Moseley's line of work; the selective breeding of certain
forms of life to two or three times the normal proportions. Very
well; I had to ascertain some creature which, if magnified several
times, would be deadly, and which would still be capable of entering
a large keyhole. Having determined that--"

"You found what it was?" cried Dorr.

"One moment. Having determined that, I had still to get in touch
with Professor Moseley's mysterious New York correspondent. I
figured that he must be interested in Professor Moseley's particular
branch of research or he never could have devised his murderous