Granted a group consisting of a patriarch whose marital rights extend over all its females, and of young males whose attitude,[2] from a sexual point of view, is marked by the strict reserve ordained by the primal law, it by no means follows that such celibacy of the young males would extend beyond the feminine element of their own troop. On the contrary, the whole of the outside world remains free for them to choose from. In fact, it is evident that it is there, in the world outside of the group, that their future mates must be found. On the component females of the parent horde a ban has been for ever laid, but all else of womankind are free of the interdict; they are beyond the law, and ‘Sin is not imputed where there is no law.’ Here, then, in the outer world, would their wives be sought. The complication we have mentioned would arise when, after successful captures of females by the young males, captures which it is hardly necessary to state would have been ‘hostile,’ the introduction of their captives within the parental group took place. The presence of females not to be his own within a circle where all that was feminine had ever been his in undisputed right, would certainly stir to its depths the soul of the Cyclopean type of parent. Such a situation must in its inception have caused a friction full of menace to the new order of things. The only solution would be, as we have said, in the further evolution of law in remedy. We shall, as before, expect to find the law ordaining restrictions on intercourse between certain individuals, and marked with the archaic characteristic of mere visual action being sufficient for its interpretation. Such, then, as it was, we still find it, in the habit still common with many races of avoidance between father-in-law and daughter-in-law. In mute avoidance between these two could peace alone endure in the new crisis. The new rule implied the development of the same respect by the father for the marital rights of the son, as we have seen the primal law to have had for effect as regards the paternal prerogatives. Natural selection would come into play in the consolidation of this new stage in legislative evolution. For the group which first adopted such a _modus vivendi_ would gain so great an advantage with each generation, in point of numbers alone, as would quickly give it supremacy. On the other hand, the forcible infringement by the father on the rights of possession by the sons in their captives, would simply result in the withdrawal of the sons and their women. Hence disruption of the group, and a fatal retrogression to the archaic type with all the weakness implied in a sole male component.