Which preposition to use with mercurius

in Occurrences 2%

"Horum quos enumeravimus omnium defectuum remedia," says the Bacon of the seventeenth century, "...opera sunt vere basilica; erga quae privati alicujus conatus et industria fere sic se habent ut Mercurius in bivio, qui digito potest in viam intendere, pedem inferre non potest."De

Which preposition to use with  mercurius