In its apparent laziness, in its awful deliberation, and its quick spasms of wrath, it was more like the work of waves than of men; and our high platform's gentle sway and glide was exactly the motion of a ship drifting with us toward that shore.

Sway is a common noun, of the third person, singular number, neuter gender, and objective case; and is governed by exert; according to Rule 5th, which says, "A noun or a pronoun made the object of an active-transitive verb or participle, is governed by it in the objective case."

That peculiar swaying of the shoulders which you see done everywhere by the blond girls of the chorus is nothing more than a movement from the Negro dance referred to above, the "eagle rock."