<p>The power of imagination is essential to supreme statesmanship. Indeed, no really originative genius in any domain of the mind can succeed without it. In literature it reigns paramount. Of art it is the soul. Without it the historian is a mere registrar of sequence, and no interpreter of characters. In science it decides the end towards which the daring of a Verulam, a Newton, a Herschel, a Darwin, can travel. On the battle-field, in both elem...