Commentary Inf III 112-120
Where each of the first two cantos has had two major similes ([Inf. I. 22-27]; [Inf. I. 55-60]; [Inf. II. 37-42]; [Inf. II. 127-132]), the third canto reserves its similetic energy for this double simile that describes the final action of the canto, the departure of the sinners in Charon's skiff. It is a commonplace that the third canto is the most 'Virgilian' canto of the Commedia. In fact, study has shown that it has more than twice as many Virgilian citations than any other canto in the poem (see Hollander [Holl.1993.1], pp. 250-251). This double simile has long been recognized as involving an amalgam of two Virgilian passages (Aen. VI.309-312 and Georg. II.82). It has also been understood as comprising the 'controlling simile' for the entire poem, combining pagan and Christian elements: see the article by M. Frankel (Fran.1982.1).