"At Charenton I watched them.
— It seems so, Stephen said, when he wants to do for him, and for all other and singular uneared wombs, the holy office an ostler does for the stallion." (U9.662)

Charenton can mean several places, but I think it refers to Charenton-le-Pont, a commune 6.2 km (3.8 miles) southeast from Paris, on the Seine river. It can be reached from Paris by boat, or simply by walking along the quays.