'Did Mr Baker put an advertisement in the newspaper
about his hat and goose?' I asked.
'No.' answered Holmes.
'Then how can we find him?'
'Well. perhaps his hat can help us.' said Holmes. 'Here's
my magnifying glass, Watson. Now, you be a detective for
a minute or two. What can you tell me about the owner of
this hat?'
I took the magnifying glass and looked at the hat. It was
black but old, and very, very dirty. I saw the letters H.B. in
it. For me it was no different from any other old black hat.
'I can see nothing.' I said, and I gave the hat back to my
friend.
'Excuse me, Watson. You do see. but you don't think
about what you see
you know.'