The last class of allusions, and one which in books written to-day is especially common, is that which calls up passages or characters in literature itself. We speak of a "quixotic deed;" we allude to a thing as to be taken "in a Pickwickian sense;" we have become so accustomed to hearing a married man spoken of as a "Benedick," that we often forget the brisk and gallant bachelor of "Much Ado about Nothing," and how he was transformed into "Benedick the married man" almost without his own consent. When an author who weighs his words employs allusions of this sort, it is needful to know the originals well if we hope to get the real intent of what is written. In "Il Penseroso," Milton says:-- Sometime let gorgeous Tragedy In sceptered pall come sweeping by, Presenting Thebes or Pelops' line, Or the tale of Troy divine. There should pass before the mind of the reader all the fateful story of the ill-starred house of Labdacus: the horrible history of OEdipus, involved in the meshes of destiny; the deadly strife of his sons, and the sublime self-sacrifice of Antigone; all the involved and passionate tragedies of the descendants of Pelops: Agamemnon, the slaughter of Iphigenia, the vengeance of Clytemnestra, the waiting of Electra, the matricide of Orestes and the descent of the Furies upon him; and after this should come to mind the oft-told tale of Troy in all its fullness. Milton was not one to use words inadvertently or without a clear sense of all that they implied. He desired to suggest all the rich and tragic histories which I have hinted at, to move the reader, and to show how stirring and how pregnant is tragedy when dealing with high themes. In two lines he evokes all that is most potent in Grecian poetry. Or again, when Wordsworth speaks of The gentle Lady married to the Moor, And heavenly Una with her milk-white lamb, it is not enough to glance at a foot-note and discover that the allusion is to Desdemona, and to the first canto of Spenser's "Faerie Queene." The reader is expected to be so familiar with the poems referred to that the spirit of one and then of the other comes up to him in all its beauty. An allusion of this sort should be like a breath of perfume which suddenly calls up some dear and thrilling memory.