French physicist (1870–1942) who won the 1926 Nobel Prize in Physics 'for his work on the discontinuous structure of matter, and especially for his discovery of sedimentation equilibrium.' TLS in French, signed "J. Perrin," one page both sides, 5.25 x 8.25, Ministere de l'Education Nationale letterhead, January 17, 1940. Untranslated letter to R. H. McCarroll, the director of the Research Department of the Ford Motor Company. In fine condition. Accompanied by the original mailing envelope. RRAuction COA.
