"He sends and receives messages from the roof of his house in Thirty-seventh Street by homing pigeons!" "Some more fandastics, eh, Laadham ?" Mr.Schultze taunted.

"Some more chimericals ?" "I demonstrate this much by the close watch I have kept of Mr.Wynne," the detective went on, there being no response to his questioning look at Mr.Schultze.

"One of my agents, stationed on the roof of the house adjoining Mr.Wynne's" (it was the maid-servant next door) "has, on at least one occasion, seen him remove a tissue-paper strip from a carrier pigeon's leg and read what was written on it, after which he kissed it, gentlemen, kissed it; then he destroyed it.

What did it mean?
It means that that particular message was from the girl to whom he transferred the diamonds in the cab, and that he is madly in love with her." "Oh, dese wimmins! I dell you!" commented Mr.Schultze.
There was a little pause, then Mr.Birnes continued impressively: "This correspondence is of no consequence in itself, of course.

But it gives us this: Carrier pigeons will only fly home, so if Mr.
Wynne received a message by pigeon it means that at some time, within a week say, he has shipped that pigeon and perhaps others from the house in Thirty-seventh Street to that person who sent him the message.