Which preposition to use with reflux

of Occurrences 25%

83° E., in the path of the reflux of the Agulhas current, than in long.

toward Occurrences 1%

So with the strong-flowing current in the streets of a great city; for how else shall we interpret this intricate net-work of human feature and movement,this flux of life toward some troubled centre, and then its reflux toward some uncertain and undefined circumference?

Which preposition to use with  reflux