Arthur, Mary and Norman Prior, Arthur's father, their children Ann and Martin, third and fourth from left, and their cousins. The picture is taken in the summer of 1953, at the farm of Arthur's half sister Elaine and her husband Iain.
From left: Arthur Prior, Gilbert Ryle and Edward Percival (zoology prof.), in front of Prior's home at 23 Vernon Terrace in Christchurch in 1954, during Ryle's visit to New Zealand.