Balls per over

In 1889 the immemorial four ball over was replaced by a five ball over and then this was changed to the current six balls an over in 1900. Subsequently, some countries experimented with eight balls an over. In 1922, the number of balls per over was changed from six to eight in Australia only. In 1924 the eight ball over was extended to New Zealand and in 1937 to South Africa. In England, the eight ball over was adopted experimentally for the 1939 season; the intention was to continue the experiment in 1940, but first-class cricket was suspended for the Second World War and when it resumed, English cricket reverted to the six ball over. The 1947 Laws of Cricket allowed six or eight balls depending on the conditions of play. Since the 1979/80 Australian and New Zealand seasons, the six ball over has been used worldwide and the most recent version of the Laws in 2000 only permits six ball overs