Note 2139 — Chapter XII · EXPORTS OF THE ISLANDS, ITALY, GAUL, AND SPAIN.
Reading edition
Theoph. de Lapid. § 21. Pumice stones are at present found in great numbers on the shores of the Troad, whither Chandler supposes them to have been floated by the waves from Mount Ætna or Vesuvius, though an abundant supply appears to be constantly furnished by the volcanic islands of the Archipelago. Travels, i. 26.