Upon Appleton House is a poem in which superficial sprightliness and subterranean portentousness, a variety of rhetorical stances, and a loose, episodic structure apparently conspire to create disunity. But a unifying principle is supplied by the formulaic topos of the locus amoenus. As this convention developed from Homer through the Elizabethans, it took on potentially ambiguous connotations of refection, generation, and eroticism. Marvell systematically exploits these connotations, making of the Fairfax estate a double microcosm which reflects a disorderly world and his own uncertain relation to it. The confusion is further mirrored in Marvell's deployment of the topos. As rhetorical device, its impact should normally be synchronous, so that its elements strike the reader as a unit, not as a sequence of terms successively qualifying one another. But Marvell breaks the unit down, anatomizes it, taking its topographical elements (garden, grass, shade, water) serially and discontinuously. Gradually, however, the locus reasserts its mythic totality. As it does, Marvell also traces a historical movement back through the development of civilization to the first locus amoenus, Eden, and a rhetorical movement from critical objectivity to devotional subjectivity. These movements come to a focus in the figure of Maria Fairfax, whom Marvell, as poet-priest, adores as summarizing the virtues of Appleton House, now become the emblem of a reordered cosmos, a refuge from the corrupting processes of time and change. The vision cannot last, as Marvell implies by sustaining the mocking extravagance of his language right through to the last, ambiguous lines. The unity is only poetic, conceptual, rhetorical. But a unity it is, sung out of confusions, with the locus amoenus as its major chord.