Yet I must go, and at once, to the place where you found the velvet knot.

Do you describe the spot exactly, so that I may find it, and make no mistake.' He nodded, and after a moment's reflection answered, 'You know the Rue St.Denys, M.de Marsac?
Well, go down it, keeping the "Bleeding Heart" on your left.

Take the second turning on the same side after passing the inn.

The third house from the corner, on the left again, consists of a gateway leading to the Hospital of the Holy Cross.
Above the gateway are two windows in the lower story, and above them two more.

The knot lay below the first window you come to.