The introduction of negro slavery into the colony is thus noted by John Rolfe: “About the last of August [1619] came in a Dutch man of warre, that sold us twenty Negars.”[254] During this year there were sent to the colony more than twelve hundred settlers, and one hundred “disorderly persons” or convicts, by order of the King, to be employed as servants. Boys and girls picked up in the streets of London were also sent, and were bound as apprentices[255] to the planters until the age of majority. In June twenty thousand pounds of tobacco, the crop of the preceding year, was shipped to England. In November the London Company adopted a coat-of-arms, and ordered a seal to be engraved.[256] The Company appears ever to have held in due regard the importance of education as intimately connected with the preservation and dissemination of Christianity in the colony. Under an order from the King, nearly £1,500 were collected by the bishops of the realm to build the college at Henrico, and fifteen thousand acres of land were appropriated for its support.[257] To cultivate it during the years 1619 and 1620 one hundred laborers were sent over under the charge of Mr. George Thorpe (a kinsman of Sir Thomas Dale) and Captain Thomas Newce as agents. At a meeting of the Company held June 28, 1620, the Earl of Southampton was elected to succeed Sir Edwin Sandys as treasurer. The population of the colony in July was estimated at four thousand, and during the year forty thousand pounds of tobacco were shipped to England. The freedom of trade which the Company had enjoyed for a brief interval with the Low Countries, where they sold their tobacco, was in October, 1621, prohibited in Council, and thenceforward England claimed a monopoly of the trade of her plantations. The planters at length were absolved from service to the Company, and enjoyed the blessings of property in the soil and of domestic felicity. In the autumn of 1621 the practice was begun by the Company of shipping to the colony young women of respectability as wives for the colonists, who were chargeable with the cost of transportation. This charge was at first one hundred and twenty, afterwards one hundred and fifty, pounds of tobacco. A windmill, the first in America, was about this time erected by Sir George Yeardley, and iron-works (the primal inauguration of this essential manufacture in this country) were established at Falling Creek on James River, under the management of Mr. John Berkeley.[258]