When Bob opened the kitchen walls, he also found wattle and daub.
(Wattle and daub, found behind the walls in the kitchen.)
John and I did not know what that was, so Bob explained it.
Wattle and daub is an ancient form of building material, consisting of clay and straw. The presence of wattle and daub in the structure of a building helps to identify it as belonging to the “First Period” of colonial architecture in America.