In the Greek drama there were no formal divisions into scenes and acts; there were no means, therefore, of allowing for the necessary lapse of time between one part of the dialogue and another, and unity of time in a strict sense was, of course, impossible. To overcome that difficulty of accounting for time, which is effected on the modern stage by dropping a curtain, the judgment and great genius of the ancients supplied music and measured motion, and with the lyric ode filled up the vacuity. In the story of the Agamemnon of Æschylus, the capture of Troy is supposed to be announced by a fire lighted on the Asiatic shore, and the transmission of the signal by successive beacons to Mycené. The signal is first seen at the 2lst line, and the herald from Troy itself enters at the 486th, and Agamemnon himself at the 783rd line. But the practical absurdity of this was not felt by the audience, who, in imagination stretched minutes into hours, while they listened to the lofty narrative odes of the chorus which almost entirely fill up the interspace. Another fact deserves attention here, namely, that regularly on the Greek stage a drama, or acted story, consisted in reality of three dramas, called together a trilogy, and performed consecutively in the course of one day. Now you may conceive a tragedy of Shakspeare's as a trilogy connected in one single representation. Divide Lear into three parts, and each would be a play with the ancients; or take the three Æschylean dramas of Agamemnon, and divide them into, or call them, as many acts, and they together would be one play. The first act would comprise the usurpation of Ægisthus, and the murder of Agamemnon; the second, the revenge of Orestes, and the murder of his mother; and the third, the penance and absolution of Orestes;--occupying a period of twenty-two years. The stage in Shakspeare's time was a naked room with a blanket for a curtain; but he made it a field for monarchs. That law of unity, which has its foundations, not in the factitious necessity of custom, but in nature itself, the unity of feeling, is every where and at all times observed by Shakspeare in his plays. Read 'Romeo and Juliet';--all is youth and spring;--youth with its follies, its virtues, its precipitancies;--spring with its odours, its flowers, and its transiency; it is one and the same feeling that commences, goes through, and ends the play. The old men, the Capulets and the Montagues, are not common old men; they have an eagerness, a heartiness, a vehemence, the effect of spring; with Romeo, his change of passion, his sudden marriage, and his rash death, are all the effects of youth;--whilst in Juliet love has all that is tender and melancholy in the nightingale, all that is voluptuous in the rose, with whatever is sweet in the freshness of spring; but it ends with a long deep sigh like the last breeze of the Italian evening. This unity of feeling and character pervades every drama of Shakspeare.