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Rh crisis can weld it, to purposeful action. It renders the mass mobile though it immobilizes personality. The symbol is the instrument by which in the short run the mass escapes from its own inertia, the inertia of indecision, or the inertia of headlong movement, and is rendered capable of being led along the zigzag of a complex situation.

But in the longer run, the give and take increases between the leaders and the led. The word most often used to describe the state of mind in the rank and file about its leaders is morale. That is said to be good when the individuals do the part allotted to them with all their energy; when each man's whole strength is evoked by the command from above. It follows that every leader must plan his policy with this in mind. He must consider his decision not only on "the merits," but also in its effect on any part of his following whose continued support he requires. If he is a general planning an attack, he knows that his organized military units will scatter into mobs if the percentage of casualties rises too high.

In the Great War previous calculations were upset to an extraordinary degree, for "out of every nine men who went to France five became casualties." The limit of endurance was far greater than anyone had supposed. But there was a limit somewhere.