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Macbeth, the most awful creation of the poetic mind, is a study every way worthy of those to whom the storms of passion present the frequent cause of mental disease. The historian studies the temper of the mind in its most ardent heats, that he may gain a clue to the causation of human events; the statesman, that he may obtain  foreknowledge of tendencies to human action; and the psychologist, for the more beneficent purpose of acquiring that knowledge as the means of alleviating the most terrible of calamities, and of doing that which the terrified physician in this tragedy dared not attempt, of "ministering to the mind diseased." The philosopher studies the laws of storms, that he may teach the mariner to avoid the destructive circle of their influence; and the physician, whose noble object of study is the human mind, seizes every opportunity of making himself acquainted with the direction and events of its hurricane movements, that he may perchance lead some into a port of safety, or at least that he may assist in the restoration of the torn and shattered bark. But to stand on one side and calmly contemplate the phenomena of human passion, like the chorus in the old Greek drama, is the lot of few. When the elements of human passion are in fierce strife, there is no near standing-place for the foot of science, like the deck of