“Well, don’t say anything about it,” went on Mr. Newton, in a low tone, “but we may be able to work up a clew in that burglary story.”

“You mean that safe robbery we were up to this morning?”

“That’s the one. I think the paper you found may prove of value. But I want to be sure of my ground before I go any further. So if you will come to the chemist’s with me to-night we’ll see what may develop.”

Larry didn’t see how a scrap of paper with a few blue finger-marks on it was going to be much of a clew to discover safe-blowers by, but he said nothing.

It was arranged that he was to call at Mr. Newton’s house after supper. He found the older reporter waiting for him, and they took a car.

“Of course, I needn’t tell you to keep quiet about this,” said Mr. Newton. “I haven’t said anything, even to Mr. Emberg, about it, for fear I might be mistaken, and get laughed at for my pains.”

“I’ll not say anything,” promised Larry.

In a short while they found themselves at the office of the chemist. The place was shut up, but Mr. Newton seemed to know where the scientist lived, for he rang a bell a few houses off, and, when a girl answered the door, asked:

“Is Mr. Hosfer in?”

“He is, but he’s very busy.”