By 1658 the Assembly had received from several Indian tribes so many complaints of being deprived of their land, either by force or fraud, that measures were again adopted to protect the natives in their rights. No member of the colony was allowed to occupy lands claimed by the natives without consent from the Governor and Council or from the commissioners of the territory where the settlement was intended. To decrease the chances for cheating the Indians, all sales were to be consummated at quarter courts where unfair purchases could be prevented. Efforts to protect the Indians in the possession of their lands were subject to modification from time to time. The treaty of 1646 designated the York River as the line to separate the settlements of the English and the natives. But the colony at that time was on the eve of a great period of expansion. With an estimated population of 15,000 in 1650, the colony increased by 1666 to approximately 40,000, and by 1681 to approximately 80,000. To stem the tide of the advancing English settlement was apparently an impossibility. Therefore, Governor William Berkeley and the Council, upon representation from the Burgesses, consented to the opening of the land north of the York and Rappahannock rivers after 1649. At the same time the provision making it a felony for the English to go north of the York was repealed. This turn in policy, based upon the assumption that some intermingling of the white and red men was inevitable, led to the effort to provide for an "equitable division" of land supplemented by attempts to modify the Indian economy which had previously demanded vast areas of the country. Endeavoring to provide for this "equitable division" of land, the Assembly in 1658 forbade further grants of lands to any Englishmen whatsoever until the Indians had been allotted a proportion of fifty acres for each bowman. The land for each Indian town was to lie together and to include all waste and unfenced land for the purpose of hunting. This provision did not relieve all pressure on Indians' lands, partly because some of the natives never received their full proportion and partly because some had been accustomed to even larger areas. But it did serve as a basis for reservation of land for different tribes. [Illustration: From a portrait reproduced in J. H. Claiborne, _William Claiborne of Virginia_. Photo by Flournoy, Virginia State Chamber of Commerce. William Claiborne, Surveyor for Virginia, Secretary of the Colony of Virginia] [Illustration: _How to reduce all sorts of grounds into a square for the better measuring of it._ From John Norden's "Surveior's Dialogue" Photo by T. L. Williams]