1376. The instrumental ablative is used with verbs of motion to denote
the route taken: as,
#Aurēliā viā profectus est#, _C._ 2, 6, _he has gone off by the Aurelia
Road_. #omnibus viīs sēmitīsque essedāriōs ex silvīs ēmittēbat#, 5, 19,
2, _he kept sending his chariot men out by all possible highways and
byways_. #hīs pontibus pābulātum mittēbat#, Caes. _C._ 1, 40, 1, _by
these bridges he sent foraging_. #frūmentum Tiberī vēnit#, L. 2, 34, 5,
_some grain came by the Tiber_. #lupus Ēsquilīna portā ingressus per
portam Capēnam prope intāctus ēvāserat#, L. 33, 26, 9, _a wolf that came
in town by the Esquiline gate had got out through the Capene gate,
almost unscathed_. This construction gives rise to some adverbs: see
707. The ablative of the route is sometimes used with a substantive of
action (1301): as, #nāvigātiō īnferō#, _Att._ 9, 5, 1, _the cruise by
the lower sea_. #eōdem flūmine invectiō#, _Fin._ 5, 70, _entrance by the
same river_.
(B.) THE INSTRUMENTAL PROPER.