Statistics for occurrence #1 of “Vesuvius” in book 7, commline 738 of John Conington, Commentary on Vergil's Aeneid, Volume 2:
...e
were two or three writers so called (Dict.
B. Conon). For Sarnus see Dict. G.,
where it is said that the course of the
river is not now what it was, having
doubtless been changed by the eruption of
Vesuvius which overthrew Herculaneum
and Pompeii.
...