v. 55. From the left.] Vellutello observes an imitation of Lucan in this passage:

Ignotum vobis, Arabes, venistis in orbem,
Umbras mirati nemornm non ire sinistras.
Phars. s. 1. iii. 248

v. 69 Thou wilt see.] “If you consider that this mountain of Purgatory and that of Sion are antipodal to each other, you will perceive that the sun must rise on opposite sides of the respective eminences.”

v. 119. Belacqua.] Concerning this man, the commentators afford no information.

CANTO V

v. 14. Be as a tower.] Sta ome torre ferma

Berni, Orl. Inn. 1. 1. c. xvi. st. 48:
In quei due piedi sta fermo il gigante
Com’ una torre in mezzo d’un castello.

And Milton, P. L. b. i. 591.
Stood like a tower.

v. 36. Ne’er saw I fiery vapours.] Imitated by Tasso, G. L, c.
xix t. 62:
Tal suol fendendo liquido sereno
Stella cader della gran madre in seno.

And by Milton, P. L. b. iv. 558:
Swift as a shooting star
In autumn thwarts the night, when vapours fir’d
Impress the air.