Cosmoglotta A, 1948, p. 122, su anno.onb.ac.at.
«English translation: The final exchange of telegrams between us was your telegram in March 1938 where you asked me if I would go to The Hague to participate in the IALA conference, and my quick negative response, not followed by a letter explaining why. You certainly had guessed the cause, but you cannot know what actually happened. Immediately after the coming of Hitler I had the "honour", as president of an international organisation, to be watched by the Gestapo, which interrogated me multiple times and searched through my house, confiscating a large part of my correspondence and my interlinguistic material."»