Founder of psychoanalysis. TLS, in German, signed 'Freud,' one page, 6 x 9, personal letterhead, December 28, 1923. Freud sends his regrets. In full, 'My response to your kind invitation unfortunately is very simple - for health reasons it is impossible for me to travel to Geneva and I therefore cannot take a side trip to Lausanne either.' Rusty paperclip marks to top, wrinkling and two mailing folds lightly affecting signature, otherwise very good condition. COA John Reznikoff/PSA/DNA and RRAuction COA.