emldquo;In the centre of the great stone walls ... are two massive stone rings four feet in diameter... These walls we considered identical in their uses and purposes with the parallel structures supporting the rings at Uxmal. In the account of the diversions of Montezuma by Herrera: lsquo;The King took much Delight in seeing Sport at Ball... The Ball was made of the Gum of a Tree...rsquo;rdquo;/em