Austrian physician (1857–1940) who won the 1927 Nobel Prize in Medicine for his work in the treatment of mental illness. ALS in German, signed “Prof. Wagner-Jauregg,” one page, 8.25 x 13.5, April 12, 1921. Untranslated letter, signed twice, with a portion written on April 12, and a follow-up added on the 15th. Light overall toning, intersecting folds, stamp and notation to top, and punch holes to top left, otherwise fine condition. RRAuction COA.