in avoiding one, a forger, ever so clever, falls into another."

Carlton felt the polite third degree, as he proceeded: "Nowadays the
forger has science to contend with, too. The microscope and camera
may come in a little too late to be of practical use in preventing
the forger from getting his money at first, but they come in very
neatly later in catching him. What the naked eye cannot see in this
check they reveal. Besides, a little iodine vapor brings out the
original 'Green & Co.' on it.

"We have found out also that the protective coloring was restored by
water color. That was easy. Where the paper was scratched and the
sizing taken off, it has been painted with a resinous substance to
restore the glaze, to the eye. Well, a little alcohol takes that
off, too. Oh, the amateur forger may be the most dangerous kind,
because the professional regularly follows the same line, leaves
tracks, has associates, but," he concluded impressively, "all are
caught sooner or later--sooner or later."

Dunlap managed to maintain his outward composure admirably. Still
the little lifting of the curtain on the hidden mysteries of the new
detective art produced its effect. They were getting closer, and
Dunlap knew it, as Drummond intended he should. And, as in every
crisis, he turned naturally to Constance. Never had she meant so
much to him as now.

That night as he entered the apartment he happened to glance behind
him. In the shadow down the street a man dodged quickly behind a
tree. The thing gave him a start. He was being watched.