In 1929, he published a book called The Mind at Mischief, in which he explained the fraudulent methods of mediums and how self-deception leads to psychic claims.
Aastal 1929 avaldas ta raamatu "The Mind at Mischief "(Üleannetu meel), kus ta selgitas meediumide petturlikke meetodeid ning kuidas enesepettus viib psüühiliste kõrvalekalleteni.