[Sidenote: Means of control.] The agent of the sovereign in these matters was from 1696 to 1760 the so- called Lords of the Board of Trade and Plantations. This commission, appointed by The Crown, corresponded with the governors, made recommendations, and examined colonial laws. Through them were exercised the two branches of English control. Governors were directed to carry out a specified policy or to veto specified classes of laws. If they were disobedient or weak, the law might still be voided by a royal rescript. The attorneys-general of the Crown were constantly called on to examine laws with a view to their veto, and their replies have been collected in Chalmers's "Opinions,"--a storehouse of material concerning the relations of the colonies with the home government. The process of disallowance was slow. Laws were therefore often passed in the colonies for successive brief periods, thus avoiding the effects of a veto; or "Resolves" were passed which had the force, though not the name, of statutes. In times of crisis the Crown showed energy in trying to draw out the military strength of the colonies; but if the assemblies hung back there was no means of forcing them to be active. During the Stuart period the troubles at home prevented strict attention to colonial matters. Under the Hanoverian kings the colonies were little disturbed by any active interference. In one respect only did the home government press hard upon the colonies. A succession of Navigation Acts, beginning about 1650, limited the English colonies to direct trade with the home country, in English or colonial vessels. Even between neighboring English colonies trade was hampered by restrictions or absolute prohibitions. Against the legal right of Parliament thus to control the trade of the colonies the Americans did not protest. Protest was unnecessary, since in 1750 the Acts were systematically disregarded: foreign vessels carried freights to and from American ports; American goods were shipped direct to foreign countries (§ 23; Colonies, §§ 44, 128). 9. SOCIAL AND ECONOMIC CONDITIONS. [Sidenote: Social life.] [Sidenote: Intellectual life.] [Sidenote: Economic conditions.]