Bath stone

Mullins quotes Stewart from an interview with Rolling Stone.

That evening in the gondola, with one old and two newer friends, is marked with a white stone in my recollection.

Monsieur,” growls the baron, “stone walls have ears, you say if only they had tongues; what tales these could tell!

A colossal steam "traveller" had ceaselessly carried great blocks of stone and long steel girders from point to point.

The clink of the stone-masons' chisels had resounded year after year from morning till night.

A few small rocks of some soft stone may be added, and in between these the Ferns are planted.