The head enginemen shall have the carts and barrels attached to their several districts always in readiness, in good order, and the barrels filled with water, which shall accompany the engines to the fire. On arriving at the spot, the head enginemen shall take their instructions from the superintendent, or, in his absence, from the chief magistrate in attendance on the spot; or, in their absence, from a member of the fire-engine committee, and from no other person whatever. V.--FIREMEN. The firemen shall attend at all times when required by the head enginemen or superintendent, as well as upon the days of general inspection. They shall keep their engines in good order and condition, and shall be equipped in their uniform at all times when called out. They shall observe the instructions of no person whatever, except those of the superintendent or head enginemen. VI.--HIGH CONSTABLES AND COMMISSIONERS OF POLICE. Upon occasions of fire, the moderator of the high constables shall call out the high constables, and, if necessary, he shall also call out the extra constables, and give notice to call out the constables of their districts; and it shall be the duty of the constables to preserve order and to protect property, to keep the crowd away from the engines, and those employed about them; and, when authorized by the chief magistrate, superintendent of engines, or, in the absence of a magistrate, by a member of the committee on fire-engines, to provide men for working the engines. Neither the constables nor the commissioners of police shall assume any management, or give any directions whatsoever, except in absence of a magistrate and the superintendent of engines, in which case any member of the committee on fire-engines may give orders to the head enginemen. In cases of protracted fire, when extra men may be required to relieve the regular establishment, it shall be the duty of the high constables to collect those wanted, from amongst the persons on the street who may be willing to lend their assistance, mustering them in such parties as may be required, taking a note of their names, and furnishing each individual with a certificate or ticket, with which the moderator of the high constables, or chief constable at the time, will be supplied; and no person shall receive any remuneration for alleged assistance given at a fire who may not produce such certificate or ticket. The party or parties so mustered shall be placed and continue under the care of two high constables, until required for service, when they shall be moved forward to the engine. The men relieved by the party so moved forward, shall be taken charge of by two high constables, who shall see them properly refreshed and brought back within a reasonable time, so that the men employed may thus occasionally relieve each other without confusion, and without being too much exhausted. VII.--MAGISTRATES, &c.