A most interesting cause of the growth of the colonial merchant marine is found in the bounties which the navigation laws offered to, and the facilities they provided for, those who would engage in clandestine trade. It was unlawful to carry tobacco from the colonies direct to a foreign port, but the export of fish and staves was permitted. Importations of salt were permitted, but Spanish iron must be purchased in England at a time when Spanish iron was the best in the world for ship-builder's use. The restriction on tobacco lowered the price in the colonies; that on the iron raised the price there. If tobacco were clandestinely exported direct to Spain and iron brought directly home, the ship made far greater profits than in the days before the hated laws. Moreover, the smuggled cargo paid no tariff-for-revenue dues or port charges. And it was easy to smuggle in any kind of a cargo. In connection with this provision of a bounty on smuggling, consider the influence of the fact that the laws were intentionally unfair to the colonists. The colonists resented the injustice, and all the more because their trade previous to the enactment of the laws had been free. Then the conditions under which the laws were enforced were inquisitorial and otherwise vexatious. A time came when forts were built and revenue cutters were provided for the enforcing of the laws, and the officials of forts and cutters were insolent and overanxious to confiscate accused ships. Recall, now, the mental attitude of the colonists toward all authority. Some had emigrated from England to escape religious tyranny. Many had come over as indentured servants, looking forward to a time when they should be free, and become men of influence. Then all the conditions of colonial life, and especially its dangers, cultivated a feeling of manly independence of all authority. Finally, the colonists had from the first made at least their local laws according to their own standards of right. "It is not unknown to you that they look upon themselves as a free State ... there being many against owning the King, or having any dependence on Engld." (Letter dated March 11, 1660.) In short, the colonists had been rapidly developing the American habit of doing what they happened to believe to be right, regardless of the law in the case, and they called, or were to call, this habit an appeal to the "higher law." Inspired by honest indignation and an opportunity to increase their profits, the colonial ship-owners and crews, with much unanimity, appealed to the "higher law."