It has been argued that such highly organized and long prepared warfare as the world saw in 1914-18 is not likely to recur again for a considerable time because of the shock inflicted by it upon social stability. There may be spasmodic wars with improvised and scanty supplies, these superficially more hopeful critics admit, but there remain no communities now so stable and so sure of their people as to prepare and wage again a fully elaborated scientific war. But this view implies no happier outlook for mankind. It amounts to this, that so long as men remain disordered and impoverished they will not rise again to the full height of scientific war. But manifestly this will only be for so long as they remain disordered and impoverished. When they recover they will recover to repeat again their former disaster with whatever modern improvements and intensifications the ingenuity of the intervening time may have devised. This new phase of disorder, conflict, and social unravelling upon which we have entered, this phase of decline due to the enhanced and increasing powers for waste and destruction in mankind, is bound, therefore, to continue so long as the divisions based upon ancient ideas of conflict remain; and if for a time the decadence seems to be arrested, it will only be to accumulate under the influence of those ideas a fresh war-storm sufficiently destructive and disorganizing to restore the decadent process. Unless mankind can readjust its political and social ideas to this essential new fact of its enormously enlarged powers, unless it can eliminate or control its pugnacity, no other prospect seems open to us but decadence, at least to such a level of barbarism as to lose and forget again all the scientific and industrial achievements of our present age. Then, with its powers shrunken to their former puny scale, our race may recover some sort of balance between the injuries and advantages of conflict. Or, since our decadent species may have less vitality and vigour than it had in its primitive phases, it may dwindle and fade out altogether before some emboldened animal antagonist, or through some world-wide disease brought to it perhaps by rats and dogs and insects and what not, who may be destined to be heirs to the rusting and mouldering ruins of the cities and ports and ways and bridges of to-day.