It gave him an idea.
Making sure that his fellow workmen were all busy, he loosened one end of the line holding the fluttering garments and then went back to his work.
As the wind increased, the strain on the line became too great, and soon he had the satisfaction of seeing the whole thing fall in one wild flap to the ground.

With an exclamation calculated to draw the attention of the men about him to what had happened, he rushed to the rescue, lifted the line and rearranged the clothes.

Then refastening--this time securely--the end of the line which had slipped loose, he returned to his post, with just one quick and disappointed look thrown back at the now safe if wildly fluttering garments.
He had improved his opportunity to examine the inside of every coat and had found nothing to reward his scrutiny.

But it was not this which had given him his chief annoyance.

It was the fact that the one coat from which he had expected the anticipated clue--the coat which Mr.Roberts had certainly worn on that tragic day at the museum--was not there.