"It was our Mystery Man, Jeremiah Long." Grace asked for the letter, which she scrutinized critically.
"No, this is not his writing," she decided.
"How do you know?
He hasn't been corresponding with you," objected Hippy.
Grace explained that Mr.Long had left a note thanking the Overlanders for their hospitality.

To make certain that she was right she went to her kit and fetched the note referred to, and also brought the note that had been tossed into their camp on the occasion of Hippy's disappearance.

The three missives were examined by each of the Overland Riders.

It was found that the message tossed into camp and the postscript of the letter found by Washington were in the same handwriting.

Mr.Long's handwriting was different.
"That disposes of the theory that either of these messages was written by Mr.Long," agreed Elfreda.