Under many constitution the law draws recruits even from foreigners; for in some democracies the son of a citizen-mother is a citizen, and the same rule holds good as to base- born sons in many places.Nevertheless, inasmuch as such persons are adopted as citizens owing to lack of citizens of legitimate birth (for legislation of this kind is resorted to because of under-poppulation),when a state becomes well off for numbers is gradually divests itself first of the sons of a slave father or mother,then of those whose mothers only were citizens, and finally only allows citizen to the children of citizen on both sides