“ The highest point of it is only 250 ft. above sea-level. It is very fertile, and the population is engaged in the cultivation of vines and fruit and in fishing. Procida, the only town, lies on the east side; its castle is now a prison. It also contains a royal palace. Classical authors explained the name of Procida either as an allusion to its having been detached from Ischia, or as being that of the nurse of Aeneas. ”