The executive powers of the city and the administration of police, except where vested in the mayor, shall be exercised by the mayor and aldermen; and they shall have the powers, and do and perform all the duties, which the selectmen of towns have, and are authorized or required to do and perform in regard to their towns, unless it is otherwise provided by law.
RSA 47:13
1846, 384:11. 1855, 1699:14. GS 42:14. GL 46:14. PS 48:14. PL 52 :11. RL 64:11.