"I ain't aimin' to prove nothin'-- to you!" he said.

But he reached into a pocket, drew out the two letters he had taken from the real Bransford's pocket, and passed them back to Mary Bransford, still facing Dale.
He grinned at Dale's face as the latter watched Mary while she read the letters, gathering from the scowl that swept over the other's lips that Mary had accepted them as proof of his identity.
"You'll find the most of that thousand you sent me in my slicker," he told the girl.

And while Mary ran to Streak, unstrapped the slicker, tore it open, and secured the money, Sanderson watched Dale's face, grinning mockingly.
"O Will--Will!" cried the girl joyously behind Sanderson.
Sanderson's smile grew.

"Seems to prove a heap, don't it ?" he said to Dale.

"I know a little about law myself.