Holmes had been examining the cover of the notebook with his magnifying lens.

     "Surely there is some discolouration here," said he.

     "Yes, sir, it is a blood-stain. I told you that I picked the book off the floor."

     "Was the blood-stain above or below?"

     "On the side next the boards."

     "Which proves, of course, that the book was dropped after the crime was committed."

     "Exactly, Mr. Holmes. I appreciated that point, and I conjectured that it was dropped by the murderer in his hurried flight. It lay near the door."
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