nine o'clock
Physicians learn these principles by their mistakes in following clues . A good diagnostician has in him the material for an immortal police inspector . I speak modestly , and yet I must say that the next morning proved that I was not mistaken in these theories . Before nine o'clock I had arrived at the Marburys ' . The banker himself opened the door . `` Doctor ! '' he cried , his face drawn out of its mask of eternal shrewdness and suspicion by a beaming smile , `` what can I say ?