Note 351 — CANTO IX.

Dexter hand: As they move across the circles, and down from one to the other, their course is usually to the left hand. Here for some reason Virgil turns to the right, so as to have the tombs on the left as he advances. It may be that a special proof of his knowledge of the locality is introduced when most needed—after the repulse by the demons—to strengthen Dante’s confidence in him as a guide; or, as some subtly think, they being now about to enter the abode of heresy, the movement to the right signifies the importance of the first step in forming opinion. The only other occasion on which their course is taken to the right hand is at Inf. xvii. 31.