—— derivation of, [147] f.
—— in -is not always ĭ-stems, [38], 1.
—— of agency, force, [353], 4.
—— used in plu. only, [56].
—— used in sing. only, [55].
—— used only in certain cases, [57].
—— indeclinable, [58].
—— with change of meaning in plural, [61].
—— syntax, [166] f.