The book "Dodger's Guide to London" has two jokes on page 103.
Why is the City of Rome* like a candle wick?... Because it's in the middle of Greece.
A horse has ten legs: he has two forelegs and two hind ones. Two fores are eight, and two others are ten!
Second joke is clear and funny. But what does first mean? It also has a footnote:
*He would have it Rome
I think it refers to former capital of Roman empire and current capital of Italy, but this city has nothing to do with Greece.