For settlers arriving after the departure of Dale in 1616 or those migrating during the seven-year period following Midsummer Day of 1618, separate regulations applied. If transported at company expense, the colonist was to serve as a half-share tenant for seven years with no promise of a land grant; if at his own expense, he was to receive as a headright fifty acres on the first dividend and the same amount on the second dividend. This provision for the fifty-acre headright was set up for the seven-year period prior to Midsummer Day of 1625, but it continued beyond this date as the essential key to Virginia's land policy of the seventeenth century. Out of the number of people who purchased a share in the company and thereby received a bill of adventure, Alexander Brown in his _Genesis of the United States_ estimated that about one-third came to Virginia and took up their land claim; approximately one-third sent over agents, or in some cases heirs, to benefit by the grants; and the remaining one-third disposed of their shares to others who occupied the lands. Provisions for special lands were also stated in "the greate charter." At each of the four focal points of settlement--James City, Charles City, Henrico, and Kecoughtan, 3,000 acres were to be set aside as the company's land. Half-share tenants were to cultivate the lands and half of the company's profits was to be used to support several of the colonial officials. For the Governor, a special plot known as the Governor's land was to be designated at Jamestown, and half of the proceeds of the tenants was to go to the Governor. For local government, additional provisions were made for support by setting aside 1,500 acres as "burroughs land" at the four points of settlement listed above.