 Five years later Olga Froebe‑Kapteyn named Portmann and the Ritsemas as her successors entrusted to carry on the work of Eranos.However, when Froebe died in April 1962, the organizational work for the Eranos sessions fell squarely on the shoulders of Rudolf Ritsema, and from 1962 to 1982, the year of Portmann’s death, the Ritsemas were single-handedly responsible for keeping the tradition of the Eranos Conferences alive.In his spare time Ritsema pursued his research into the "I Ching", which reached a turning point around 1971 when he grew dissatisfied with the critical apparatus in the Wilhelm translation, and conceived the idea of an entirely new translation.