Cob buried manure

[C. Bailey]

Talking to an old farmer, I found this anecdote interesting--especially
when considering the way cow manure can be buried with clay and used as an
exterior or interior wall covering/protectant.

Files can be sharpened by putting them in battery acid (yuch) or in the
old days they buried them in manure!  So it's either sulfuric acid or
buried manure.  These organic mixtures seem to have untold
characteristics.

Cheryl