IDSWORTH, a chapelry, in the parish of Chalton, union of Catherington, hundred of Finch-Dean, Petersfield and N. divisions of the county of Southampton, 3½ miles (E. N. E.) from Horndean; containing 396 inhabitants. It comprises 1674 acres, of which 177 are common or waste. Idsworth is the residence of the Rev. Sir Samuel Jervoise, whose splendid mansion and richly-wooded park border on the county of Sussex; the grounds are watered by a stream called Lavant, which rises here, and flows through the chapelry in its course to Portsmouth. The population, with the exception of a few employed in an iron-foundry, is engaged in agriculture.