The above view, therefore, was for the most part abandoned in favour of other, apparently more natural, explanations. Of these we would mention, as a second theory, the biological hypothesis of Andrew Lang. This author assumes that the younger brothers of a joint family were driven out by the stronger and older ones in order to ward off any want that might arise from the living together of a large number of brothers and sisters, and that these younger brothers were thus obliged to marry outside the group. Even this, however, is not an adequate theory of exogamy, since it does not explain how the custom has come to apply also to the older members of the family group. As a final hypothesis, we may mention one which may perhaps be described as specifically sociological. In its fundamental aspects it was proposed by MacLennan, the investigator who also gave us the word 'exogamy.' MacLennan does not regard exogamy as having originated in times of peace, nor even as representing voluntarily established norms of custom. He derives it from war, and in so doing he appeals to the testimony both of history and of legend. As is well known, even the Iliad, the greatest epic of the past, portrays as an essential part of its theme a marriage by capture. The dissension between Achilles and Agamemnon arose from the capture of Briseis, for whom the two leaders of the Achæans quarrelled with each other. According to MacLennan, the capture of a woman from a strange tribe represents the earliest exogamy. The rape of the Sabines is another incident suggesting the same conclusion. True, this is not an event of actual history. Nevertheless, legend reflects the customs and ideas of the past. Now, in the case under discussion, it is clear that marriage by capture involves a foreign and hostile tribe, for this is the relation which the Sabines originally sustained to the Romans. A significant indication of the connection between marriage by capture and war with hostile tribes occurs also in Deuteronomy (ch. xxi.), where the law commands the Israelites: 'If in war you see a beautiful woman and desire her in marriage, take her with you. Let her for several weeks bewail her relatives and her home, and then marry her. But if you do not wish to make her your wife, then let her go free; you shall not sell her into slavery.' This is a remarkable passage in that it forbids the keeping and the selling of female slaves, but, on the other hand, permits marriage with a woman of a strange tribe. A parallel is found in Judges (ch. xxi.), where it is related that the elders of Israel, being prevented by an oath to Jahve from giving their own daughters in marriage to the children of Benjamin, advised the latter to fall, from ambush, upon a Canaanitic tribe and to steal its maidens.