In the mind of Lady Macbeth, ambition is represented as the ruling motive, an intense over-mastering passion, which is gratified at the expense of every just and generous principle, and every feminine feeling. In the pursuit of her object, she is cruel, treacherous, and daring. She is doubly, trebly dyed in guilt and blood; for the murder she instigates is rendered more frightful by disloyalty and ingratitude, and by the violation of all the most sacred claims of kindred and hospitality. When her husband's more kindly nature shrinks from the perpetration of the deed of horror, she, like an evil genius, whispers him on to his damnation. The full measure of her wickedness is never disguised, the magnitude and atrocity of her crime is never extenuated, forgotten, or forgiven, in the whole course of the play. Our judgment is not bewildered, nor our moral feeling insulted, by the sentimental jumble of great crimes and dazzling virtues, after the fashion of the German school and of some admirable writers of our own time. Lady Macbeth's amazing power of intellect, her inexorable determination of purpose, her superhuman strength of nerve, render her as fearful in herself as her deeds are hateful; yet she is not a mere monster of depravity, with whom we have nothing in common, nor a meteor whose destroying path we watch in ignorant affright and amaze. She is a terrible impersonation of evil passions and mighty powers, never so far removed from our own nature as to be cast beyond the pale of our sympathies; for the woman herself remains a woman to the last--still linked with her sex and with humanity. This impression is produced partly by the essential truth in the conception of the character, and partly by the manner in which it is evolved; by a combination of minute and delicate touches, in some instances by speech, in others by silence: at one time by what is revealed, at another by what we are left to infer. As in real life, we perceive distinctions in character we cannot always explain, and receive impressions for which we cannot always account, without going back to the beginning of an acquaintance, and recalling many and trifling circumstances--looks, and tones, and words: thus, to explain that hold which Lady Macbeth, in the midst of all her atrocities, still keeps upon our feelings, it is necessary to trace minutely the action of the play, as far as she is concerned in it, from its very commencement to its close. We must bear in mind, that the first idea of murdering Duncan is not suggested by Lady Macbeth to her husband: it springs within _his_ mind, and is revealed to us, before his first interview with his wife,--before she is introduced or even alluded to. MACBETH.