 The resulting booklet Laws of Football as played by the Principal Clubs in Scotland, became known as The Green Book.Alas, no copy survives but it is worthy of note that neither the clubs nor "The Green Book felt" it necessary to include the word 'Rugby' in their title.Indeed, the Scottish Football Union, formed in 1873, did not alter its name to become the Scottish Rugby Union until 1924 - the year prior to the opening of Murrayfield.