But first as regards the fact of the association of adult males on friendly terms within the group, which fact has seemed to us to constitute the whole problem of progress, it would on a hasty view appear as if it had been already found in the band of exiled sons which we have seen haunting the parent horde. Here we meet with that aggregation of individuals whose combination in peaceful union should apparently be the result of some law in regulation. This idea would even seem to gain support from the fact that all the members being brothers, and living most probably in a state of polyandry, we here appear to find fulfilled exactly those genetic conditions of primitive marriage imperative according to Mr. McLennan’s theory of the origin of society. It will not, however, be difficult to prove that, at least at this stage in evolution, such a group would lack the most essential elements of stability. Their unity, in fact, as has been already pointed out, could only endure as long as the youthfulness of the members necessitated union for protection, and their immaturity prevented the full play of the sexual passion. The horde would inevitably dissolve under the influence of jealousy at the adult stage, especially if, as is probable, the number of their female captives had increased with the gain in years and power. The necessary Primal Law which alone could determine peace within a family circle by recognising a _distinction between female and female_ (the indispensable antecedent to a definition of marital rights) could never have arisen in such a body. It follows that if such law was ever evoked, it must have been from within the only other assembly in existence, viz. that headed by the solitary polygamous patriarch, ‘the Cyclopean family.’ We have said that this family would be composed of the male head and his wives, the latter consisting of captured females, and further, let us note, of his own adult female offspring, accompanied by a troop of infants of both sexes. The absence of male offspring beyond those of tender years would be another most notable phenomenon. These sons would, as we have seen, have been banished at puberty from the herd, in common with the habit of most animals.