CANTO III.  The Heaven of the Moon.--Spirits whose vows had been
broken.--Piccarda Donati.--The Empress Constance. 

CANTO IV.  Doubts of Dante, respecting the justice of Heaven and
the abode of the blessed, solved by Beatrice.--Question of Dante
as to the possibility of reparation for broken vows. 

CANTO V.  The sanctity of vows, and the seriousness with which
they are to be made or changed.--Ascent to the Heaven of
Mercury.--The shade of Justinian. 

CANTO VI.  Justinian tells of his own life.--The story of the
Roman Eagle.--Spirits in the planet Mercury.--Romeo. 

CANTO VII.  Discourse of Beatrice.--The Fall of Man.--The scheme
of his Redemption. 

CANTO VIII.  Ascent to the Heaven of Venus.--Spirits of Lovers,
Source of the order and the varieties in mortal things.