Our line of research as regards the new departure was at once narrowed when we indicated that it ended in the peaceful conjunction of father and son. Our path will lie in the examination of the question as to what possible series of natural circumstances, in the domestic life of the race, could lead to such conjunction, and what law in such an age could suffice for regulation of such association if formed. We shall have to examine more closely (as far as our imagination will aid us) the exact conditions of the family life of the semi-human group which we have supposed typical in that era, i.e. the small isolated band of anthropoids, composed of a single polygamous adult male with dependent wives and offspring. His possible relations with these, especially his attitude towards his male children, will interest us. Therein should certainly be found the desired series of circumstances entailing a critical situation, whose happy resolution shall furnish the clue to the problem of that possible aggregation on which all future progress depends. However strange it may appear, it will be found, as we have already said, that the abnormal conditions imposed by the unnatural modifications of the sexual functions have served as a means to the end of advance in progress. And as, by their action in the past, anthropoid man had become the most sexually jealous and intractable of all creatures, so it may be expected that the series of causes which shall have for effect the restraint of such excess of passion, will possess further vast potentiality of action. Such latency in potentiality is evidently indispensable when we consider that there is here concerned the evolution of law in opposition to nature, and its triumph for all time over the mere brute.