At the time of Bacon's Rebellion the annual importation of servants was between 1,500 and 2,000. The headrights for 1674 show 1931 names.[8-1] Seven years later the whites were still arriving in large numbers, the rolls for 1682 having 1,565 names. As the century drew to a close, however, the effect of the slave trade upon white immigration is reflected in the dwindling number of headrights. The change that was taking place is illustrated by a patent of 13,500 acres to Ralph Wormleley for the transportation of 249 persons, 149 of whom were white and 100 black.[8-2] Yet so late as 1704 the servants were still coming in appreciable numbers. In 1708 however, the number of servants at work in the colony had dwindled away almost entirely.[8-3] In 1715 the names of white persons listed as headrights was but ninety-one; in 1718 but 101.[8-4] In other words, the first great migration of Englishmen to continental America, a migration extending over a century and comprising from 100,000 to 150,000 men, women and children, had practically come to an end. English statesmen at the time looked upon this event as an unalloyed blessing. The day had passed when they felt that there existed a surplus of labor at home and that the country was in need of blood letting. The proper policy was to keep Englishmen in England, to devote their energies to local industries and so strengthen the economic and military sinews of the nation. And if unemployment existed, it was the correct policy to bring work to the idle rather than send the idle out of the country in quest of work.[8-5] And the colonies were to be utilized, no longer as outlets for the population, but as a means to the upbuilding of local industry. They were to supply a market for English goods, keep employed English mariners and furnish the tobacco and sugar which when re-exported weighed so heavily in the balance of trade. And since these great staple crops could be produced by the work of slaves, it was thought highly advantageous for all concerned that the negro should replace the white servant in both the tobacco and the sugar fields. The planters would profit by the lowered cost of production, English industry would gain by the increased volume of traffic, the Crown revenues would be enhanced and English laborers would be kept at home.[8-6]