He bent, making a close inspection of the skull; then turned and
shook his head.

"No, Inspector," he said definitely. "This is not the cabman. There is
no wound corresponding to the one which I dressed."

"Right," answered Dunbar, covering up the ghastly face. "That's
settled."

"You were wrong, Inspector. It was not Gaston Max who left the
envelope with me."

"No," mused Dunbar, "so it seems."

"Your theory that Max, jealously working alone, had left particulars
of his inquiries, and clues, in my hands, knowing that they would
reach Scotland Yard in the event of his death, surely collapsed when
the envelope proved to contain nothing but a bit of cardboard?"

"Yes--I suppose it did. But it sounded so much like Max's round-about
methods. Anyway I wanted to make sure that the dead man from Hanover
Hole and your mysterious cabman were not one and the same."

Stuart entertained a lively suspicion that Inspector Dunbar was keeping
something up his sleeve, but with this very proper reticence he had no
quarrel, and followed by the constable, who relocked the mortuary
behind them, they came out into the yard where the cab waited which
was to take them to Scotland Yard. Dunbar, standing with one foot upon
the step of the cab, turned to the constable.