The passages of Zosimus, of Eunapius, of Sozomen, and of Agathias, which relate to the increase of buildings and inhabitants at Constantinople, are collected and connected by Gyllius de Byzant, l. i. c. 3. Sidonius Apollinaris (in Panegyr. Anthem. 56, p. 279, edit. Sirmond) describes the moles that were pushed forwards into the sea; they consisted of the famous Puzzolan sand, which hardens in the water.