What did the witnessses testify about Muff Potter?

From the text:

Now a witness was called who testified that he found Muff Potter washing in the brook, at an early hour of the morning that the murder was discovered, and that he immediately sneaked away.

The next witness proved the finding of the knife near the corpse.

A third witness swore he had often seen the knife in Potter’s possession.

Several witnesses deposed concerning Potter’s guilty behavior when brought to the scene of the murder.

(Pages 188 and 189)