During the first seventeen years of the colony's existence the character of immigration was different from that of succeeding periods. Virginia was at this time ruled by a private trading company. This corporation, which was composed largely of men of rank and ability, kept a strict watch upon the settlers, and excluded many whom they thought would make undesirable colonists.[139] As a consequence, the class of people that came over before 1624 were more enlightened than the mass of the settlers during the remainder of the century. The London Company looked upon the whole matter as a business affair, and they knew that they could never expect returns from their enterprise if they filled their plantations with vagabonds and criminals. Those that were intrusted with the selection of settlers were given explicit instructions to accept none but honest and industrious persons. When it was found that these precautions were not entirely effective, still stricter measures were adopted. It was ordered by the Company in 1622 that before sailing for Virginia each emigrant should give evidence of good character and should register his age, country, profession and kindred.[140] So solicitous were they in regard to this matter that when, in 1619, James I ordered them to transport to Virginia a number of malefactors whose care was burdensome to the state, they showed such a reluctance to obey that they incurred the king's displeasure.[141] What tended strongly to attract a desirable class of men in the earliest years of the colony was the repeated attempt to establish manufactures. Until the charter of the London Company was revoked, that body never ceased to send over numbers of skilled artisans and mechanics. In 1619, one hundred and fifty workmen from Warwickshire and Stafford were employed to set up iron works on the James.[142] Repeated attempts were made to foster the silk industry, and on more than one occasion men practiced in the culture of the silk worm came to Virginia.[143] An effort was made to start the manufacture of glass,[144] while pipe staves and clapboards were produced in considerable quantities.[145] Moreover, numerous tradesmen of all kinds were sent to the colony. Among the settlers of this period were smiths, carpenters, bricklayers, turners, potters and husbandmen.[146] With the year 1624 there came a change for the worse in the immigration, for the lack of the Company's paternal care over the infant colony was keenly felt after the king undertook personally the direction of affairs. James I and, after his death, Charles I were desirous that Virginia should undertake various forms of manufacture, and frequently gave directions to the governors to foster industrial pursuits among the settlers, for they considered it a matter of reproach that the people should devote themselves almost exclusively to the cultivation of tobacco, but neither monarch was interested enough in the matter to send over mechanics and artisans as the