Drove past the great old brick building home to the Cavendish Historical Society (open Sundays only 2-4 pm). Drove on and came to Procterville where the Cavendish Library was open and staffed by a delightful and helpful young woman. Found "Cemeteries of Cavendish" listing several members of the French family and where they were buried.
After a quick stop for sandwiches, we made our way to the Cavendish town cemetery. Had our tailgate picnic at the top of the hill overlooking regiments of marble, slate, and granite.
Mr. Curator found Josiah French and second wife Rebecca. My ancestor was his third wife, who died elsewhere. Also found a bit of a mystery in the first wife's stone, will post that pic next. A most fruitful little side trip.