This system of cultivation made it necessary for them to secure very large plantations, for they could not be content with a tract of territory sufficiently large to keep busy their force of laborers. They must look forward to the time when their fields would become useless, and if they were wise they would secure ten times more than they could put into cultivation at once. If they failed to do this they would find at the end of a few years that their estates consisted of nothing but exhausted and useless fields. Thomas Whitlock, in his will dated 1659, says: "I give my son Thomas Whitlock the land I live on, 600 acres, when he is of the age 21, and during his minority to my wife. The land not to be further made use of or by planting or seating[47] than the first deep branch that is commonly rid over, that my son may have some fresh land when he attains to age."[48] The plantations, thus vast in extent, soon became little communities independent in a marked degree of each other, and in many respects of the entire colony. The planter, his family, his servants and slaves lived to themselves in isolation almost as great as that of the feudal barons or of the inhabitants of the vill of the 13th century. But this isolation was due even more to the direct trade between the planters and the foreign merchants than to the extent of the plantations. This was made possible by the nature of the waterways. The entire country was intersected with rivers, inlets and creeks that were deep enough to float the sea going vessels of the age, and salt water penetrated the woods for miles, forming of the whole country, as John Fiske has expressed it, a sylvan Venice. Thus it was possible for each planter to have his own wharf and to ship his tobacco directly from his own estate. Moreover, it allowed him to receive from the foreign vessels what merchandise he desired to purchase. Hugh Jones wrote, "No country is better watered, for the conveniency of which most houses are built near some landing-place; so that anything may be delivered to a gentleman there from London, Bristol, &c., with less trouble and cost, than to one living five miles in the country in England; for you pay no freight from London and but little from Bristol; only the party to whom the goods belong, is in gratitude engaged to ship tobacco upon the ship consigned to her owners in England."[49]