The essential point of these biological views is that, when the human herd is subjected to any influences that tend to arouse the herd instinct--that is, to unite the herd in any common emotion or action, the old instinctive forms of response are likely to be brought to the front. Whatever the stimulus, the tendency is for the herd to fixate its attention upon some external object, which at once is reacted to with deep emotion. Plainly, if this be true, if herd instinct does throw human society from time to time and from various causes into attitudes of defense and offense with the appropriate emotional reactions, and if in such times leaders are likely to appear, having exaggerated instinctive tendencies, there is always close at hand and ready a mechanism by which war can be produced, war being precisely of the type of mass action, under strong emotion, of a group closely united under spectacular leadership, with attention cramped upon some external object hated or feared. Nicolai (79), who believes strongly that war is wholly useless, compares it to the play we turn to when the actions performed in the play are no longer in themselves practical. War is a great debauch, perhaps now the last the race will experience. War is like wine: in it nations renew their youth. It is not the war itself, but the mood it produces that we crave, and this mood is longed for because in it old and sacred feelings of patriotism are aroused, and these feelings are themselves survivals, something romantic, archaic, no longer needed in the present stage of social life. Novicow (83) says something very similar to this. War is a survival, like the classical languages, for example. Men begin to find beauty and glory in these things only after the activities they represent are useless. The principle of their survival is nothing more or less than that of habit. It is habit that keeps war alive; wars are a concession to our forebears, a following in the footsteps of a dead past.