33. Duration of revenue-rates.

(a) revenue-rates may be altered or revise in any year after the expiry of every ten years from the date on which the table of revenue-rates was introduced, in such manner and to such extent as may be prescribed :
(b) When the circumstances of a local area are such that a fresh determination of the revenue-rates is in the opinion of the Government inexpedient, he may extend the term of settlement by such further period as it may think necessary.