French physiologist (1850-1935) who won the 1913 Nobel Prize in Medicine for his work in anaphylaxis, which led to advances in the treatment of allergies. ALS in French, one page, 6.75 x 8.25, 15 rue de l'Universite letterhead, October 27, 1928. Untranslated handwritten letter by the noted scientist. In fine condition. Encapsulated in a PSA/DNA authentication holder.