handling this yesterday, I’m sure, Clayton.  I tried the same experiment with the lampblack on it this morning, you see.  And this”—­beside the notebook he placed the police photograph; that, too, in its enlargement, showed, sharply defined, a thumb print on a diamond-shaped background.  “You will no doubt recognise it as an official photograph, enlarged, taken of the gray seal on Metzer’s forehead—­and the thumb print of Metzer’s murderer.  You have only to glance at the little scar at the edge of the centre loop to satisfy yourself that the three are identical.  Of course, there are a dozen other points of similarity equally indisputable, but—­”

Jimmie Dale stopped.  Clayton was on his feet—­rocking on his feet.  His face was deathlike in its pallor.  Moisture was oozing from his forehead.

“I didn’t do it!  I didn’t do it!” he cried out wildly.  “My God, I tell you, I didn’t do it—­and—­and—­that would send me to the chair.”

“Yes,” said Jimmie Dale coldly, “and that’s precisely where you’re going—­to the chair.”

The man was beside himself now—­racked to the soul by a paroxysm of fear.

“I’m innocent—­innocent!” he screamed out.  “Oh, for God’s sake, don’t send an innocent man to his death.  It was Stace Morse.  Listen!  Listen!  I’ll tell the truth.”  He was clawing with his hands, piteously, over the desk at Jimmie Dale.  “When the big rewards came out last week I stole one of the gray seals from the bunch at headquarters to—­to use it the first time any crime was committed when I was sure I could lay my hands on the man who did it.  Don’t you see?  Of course he’d deny he was the Gray Seal, just as he’d deny that he was guilty—­but I’d have the proof both ways and—­and I’d collect the rewards, and—­and—­” The man collapsed into the chair.

Carruthers was up from his seat, his hands gripping tight on the edge of the desk as he leaned over it.

“Jimmie—­Jimmie—­what does this mean?” he gasped out.

Jimmie Dale smiled—­pleasantly now.

“That he has told the truth,” said Jimmie Dale quietly.  “It is quite true that Stace Morse committed the murder.  Shows up the value of circumstantial evidence though, doesn’t it?  This would certainly have got him off, and convicted Clayton here before any jury in the land.  But the point is, Carruthers, that Stace Morse isn’t the Gray Seal—­and that the Gray Seal is not a murderer.”

Clayton looked up.  “You—­you believe me?” he stammered eagerly.

Jimmie Dale whirled on him in a sudden sweep of passion.

“No, you cur!” he flashed.  “It’s not you I believe.  I simply wanted your confession before witnesses.”  He whipped the three written sheets from his pocket.  “Here, substantially, is that confession written out.”  He passed it to Carruthers.  “Read it to him, Carruthers.”

Carruthers read it aloud.