Prior to the building of the Arthur Wall in the 1830s there is no record of how the entrance to the Gardens was controlled. Once the wall was built, the small door in the southern end of the wall, affectionally known as ‘the green door’, allowed passage of one person at a time which must have slowed things down on busy days. This method of admittance persisted until the installation of the new gates in 1878. The old green door remains in place and is used as occasional access for special events.