Personal service holds a peculiar place in the economic development. During the stage of quasi-peaceable industry, and especially during the earlier development of industry within the limits of this general stage, the utility of their services seems commonly to be the dominant motive to the acquisition of property in persons. Servants are valued for their services. But the dominance of this motive is not due to a decline in the absolute importance of the other two utilities possessed by servants. It is rather that the altered circumstance of life accentuate the utility of servants for this last-named purpose. Women and other slaves are highly valued, both as an evidence of wealth and as a means of accumulating wealth. Together with cattle, if the tribe is a pastoral one, they are the usual form of investment for a profit. To such an extent may female slavery give its character to the economic life under the quasi-peaceable culture that the women even comes to serve as a unit of value among peoples occupying this cultural stage--as for instance in Homeric times. Where this is the case there need be little question but that the basis of the industrial system is chattel slavery and that the women are commonly slaves. The great, pervading human relation in such a system is that of master and servant. The accepted evidence of wealth is the possession of many women, and presently also of other slaves engaged in attendance on their master's person and in producing goods for him. A division of labour presently sets in, whereby personal service and attendance on the master becomes the special office of a portion of the servants, while those who are wholly employed in industrial occupations proper are removed more and more from all immediate relation to the person of their owner. At the same time those servants whose office is personal service, including domestic duties, come gradually to be exempted from productive industry carried on for gain.