The main theme of the play is revenge of a father for a son, superintended by a ghost; and this theme attaches to itself other motives important both here and in their later developments. The revenge is delayed by hesitation on the part of Hieronimo, who finds his task a difficult one and requires much proof and superabundant deliberation to spur his irresolution into activity. Madness is another accompaniment of the main theme; the second title of the 1602 quarto, "Old Hieronimo mad againe," indicating how important it was in the stage presentation. Hieronimo pretends madness, and his pretended madness often passes into real melancholy and distraction. Isabella, his wife, is driven by insanity to suicide. Intrigue used both against and by the avenger is another important element; the villain is a machinator and Hieronimo finally accomplishes his revenge by means of dissimulation and trickery. According to both Senecan and national precedents, vengeance moves in a pathway of blood; ten of the _dramatis personae_, innocent and guilty alike, pass to "the loathsome pool of Acheron," and the final slaughter leaves five bodies to be borne from the stage. Intrigue and slaughter characterize most of the tragedies of this period, notably "The Jew of Malta," but the ghost-directed revenge, hesitation, insanity, and the meditative soliloquies distinguished more specifically the Kydian species. In spite of the medley of intrigue and carnage, there is introduced, after Senecan fashion, much philosophizing and introspection. Meditations on fate, revenge, suicide, and similar subjects play a large part in the development of the story and are most frequently given the form of soliloquies. Hieronimo's inner struggle is revealed in lonely communings, now in defense, now in bitter condemnation of his delay.