No proof he is crazy because he smells everything.
My wife does the same.

Her nose is over the registers half the time in winter to see if any gas is escaping from the furnace.

And as to this Gretchen, it is possible there was some woman with him on the ship, or in New York, and he may be a little muddled there.

You can inquire at the hotel where he stopped.' This was Mr.St.Claire's advice, and Frank acted upon it, and took immediate steps to ascertain if there had been a lady in company with his brother at the Brevoort House, where he had stopped, or if there had been any one in his company on the ship, which was still lying in the dock at New York.

But there no one had been with him.