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The principal island, Thera, has somewhat the shape of a crescent, breaking off in a precipitous cliff on the inner side, but on the outer side sloping at an angle of about fifteen degrees into deep water. Continuing the curvature of the crescent, but separated by a channel, is the island of Therasia; and between this and the southern promontory of Thera is another island called Aspronisi.

The absence of clay in the island of Santorin has thrown some doubt on this, however, but the researches of M. Fouque have revealed the former existence of a large valley, at the base of the principal cone, which valley ran down to the sea-shore near the island of Aspronisi; and in which probably was found the clay which the potters of the district soon learned to turn to account.

The AEgean Sea has ever been the theatre of igneous phenomena, and the three little islands of Thera, Therasia, and Aspronisi, which shut in the Bay of Santorin, are built up chiefly of volcanic materials.

See also a detailed and illustrated account of the eruption communicated by A. Ricco to the Annali dell' Ufficio centrale Meteorologico e Geodonamico, Ser. ii., Parte 3, vol. xi. Summarised by Mr. Butler in Nature, April 21, 1892. Ideal Section through the Gulf of Santorin, to show the structure of the submerged volcano. a. Island of Aspronisi; b. Island of Thera; 1. Old Kaimeni Island; 2.