Each station was presided over by an agent, whose province it was to see that the packets were properly equipped and victualled, to arrange the order of sailing, to keep the captains to their duty, and generally to maintain order and regularity among the unruly spirits of which the establishment was composed. The outward mails, on their arrival from London, were to be despatched, if for Holland or for Portugal, immediately, and if for the West Indies, within two days; and, as soon as they were put on board, weights were to be attached to them so that they might be sunk at once if in danger of being taken by the enemy. So important was this precaution held to be that, although enjoined in the general instructions, it was continually insisted upon in particular cases. "Be sure," write the postmasters-general to one of their agents, "that before the captain sails, he prepares everything to sink the mail in case he shall be attacked by the enemy that he can't avoid being taken"; and to another, "We would have you take care to affix a sufficient weight to the mail so soon as 'tis on board"; and to a third, "We do not doubt but the mails will be ready slung with weights sufficient to sink them in case of danger of falling into the enemy's hands." Another rule to which the postmasters-general attached great importance was that more than two mails were not to go by the same boat. This rule, however, could not always be observed, for the boats had an awkward habit of finding themselves on the wrong side, and, by the time one had arrived, there was an accumulation of mails to be disposed of.