The explanation of this state of affairs is found in the fact that tobacco, despite its widened market, experienced no very pronounced rise in price. The average return to the planters during the good years seems to have been one penny a pound.[7-23] This, it is true, constituted an advance over the worst days of the Restoration period, but it was far from approaching the prices of the Civil war and Commonwealth periods. For the poor freedman, it was not sufficient to provide for his support and at the same time make it possible to accumulate a working capital. He could not, as he had done a half century earlier, lay aside enough to purchase a farm, stock it with cattle, hogs and poultry, perhaps even secure a servant or two. Now, although no longer reduced to misery and rags as in the years from 1660 to 1682, he could consider himself fortunate if his labor sufficed to provide wholesome food and warm clothing. How, it may be asked, could Virginia and Maryland produce the vast crops now required by the foreign trade, if the price was still so low? Prior to and just after Bacon's Rebellion the planters repeatedly asserted that their labors only served to bring them into debt, that to produce an extensive crop was the surest way for one to ruin himself. Why was it that twenty years later, although prices were still far below the old level, they could flood the markets of the world? The answer can be summed up in one word--slavery. The first cargo of negroes arrived in the colony in 1619 upon a Dutch privateer. Presumably they were landed at Jamestown, and sold there to the planters.[7-24] The vessel which won fame for itself by this ill-starred action, was sailing under letters of marque from the Prince of Orange and had been scouring the seas in search of Spanish prizes. Although the Dutch master could have had no information that slaves were wanted in the colony, he seems to have taken it for granted that he would not be forbidden to dispose of his human freight. The introduction of this handful of negroes--there were but twenty in all--was not the real beginning of the slave system in the colonies. For many years the institution which was to play so sinister a part in American history did not flourish, and the slaves grew in numbers but slowly. In the Muster Roll of Settlers in Virginia, taken in 1624, there were listed only 22 negroes.[7-25] Sixteen years later the black population probably did not exceed 150.[7-26] In 1649, when Virginia was growing rapidly and the whites numbered 15,000, there were but 300 negroes in the colony.[7-27] A sporadic importation of slaves continued during the Commonwealth period, but still the number was insignificant, still the bulk of the labor in the tobacco fields was done by indentured servants and poor freeholders.