mpanion's arm. "Do you remember what I told you about those
alleyway footprints? About the pressure marks? Look!" and he pointed ahead
excitedly. "I knew it, he has gout or rheumatism, just touches that come
and go. He had it that night when he escaped from the Ansonia and he has
it now. See!"

The judge observed the prisoner carefully and nodded in agreement. There
was no doubt about it, as he walked _Groener was limping noticeably on his
left foot!_

Dr. Duprat was waiting for them in his laboratory, absorbed in recording
the results of his latest experiments. A kind-eyed, grave-faced man was
this, who, for all his modesty, was famous over Europe as a brilliant
worker in psychological criminology. Bertillon had given the world a method
of identifying criminals' bodies, and now Duprat was perfecting a method of
recognizing their mental states, especially any emotional disturbances
connected with fear, anger or remorse.

Entering the laboratory, they found themselves in a large room, quite dark,
save for an electric lantern at one end that threw a brilliant circle on a
sheet stretched at the other end. The light reflected from this sheet
showed the dim outlines of a tiered amphitheater before which was a long
table spread with strange-looking instruments, electrical machines and
special apparatus for psychological experiments. On the walls were charts
and diagrams used by the doctor in his lectures.

"Everything ready?" inquired the magistrate after an exchange of greetings
with Dr. Duprat.

"Everything," answered the latter. "Is this the--er--the subject?" he
glanced at the prisoner.

Hauteville nodded and the doctor beckoned to the guard.

"Please bring him over here. That's right--in front of the lantern." Then
he spoke gently to Groener: "Now, my friend, we are not going to do
anything that will cause you the slightest pain or inconvenience. These
instruments look formidable, but they are really good friends, for they
help us to understand one another. Most of the trouble in this world comes
because half the people do not understand the other half. Please turn
sideways to the light."

For some moments he studied the prisoner in silence.

"Interesting, _ve_-ry interesting," murmured the doctor, his fine student's
face alight. "Especially the lobe of this ear! I will leave a note about it
for Bertillon himself, he mustn't miss the lobe of this ear. Please turn a
little for the back of the head. Thanks! Great