The assembly, which had been summoned in March 1660, in the name of the King, though he was not then acknowledged in England, and which had been prorogued by the governor to the following March, then convened, and engaged in the arduous task of revising the laws of the colony. One of the motives assigned for this revision strongly marks the temper of the day. It is that they may "repeal and expunge all unnecessary acts, and chiefly such as might keep in memory their forced deviation from his majesty's obedience."[86] [Footnote 86: Virginia Laws. Chalmer.] This laborious work was accomplished; and, in its execution, the first object of attention was religion. The church of England was established by law, and provision was made for its ministers. To preserve the purity and unity of its doctrines and discipline, those only who had been ordained by some bishop in England, and who should subscribe an engagement to conform to the constitution of the church of England and the laws there established, could be inducted by the governor: and no others were permitted to preach. The day of the execution of Charles I. was ordered to be kept as a fast; and the anniversaries of the birth, and of the restoration of Charles II. to be celebrated as holy days. The duties on exports and tonnage were rendered perpetual; the privilege of the burgesses from arrest was established, and their number fixed; the courts of justice were organised; and many useful laws were passed, regulating the interior affairs of the colony.[87] [Footnote 87: Virginia Laws. Chalmer.] An effort was made to encourage manufactures, especially that of silk. For each pound of that article which should be raised, a premium of fifty pounds of tobacco was given; and every person was enjoined to plant a number of mulberry trees proportioned to his quantity of land, in order to furnish food for the silk worm. But the labour of the colony had been long directed to the culture of tobacco, and Indian corn; and new systems of culture can seldom be introduced until their necessity becomes apparent. This attempt to multiply the objects of labour did not succeed, and the acts on the subject were soon repealed. In Maryland, the legislature was also convened, and, as in Virginia, their first employment was to manifest their satisfaction with the restoration; after which they entered upon subjects of general utility. {1662} [Sidenote: Rhode Island incorporated.]