SCIENCES. 20 letters or documents, most of them autograph letters. Paul Bert (to Dr. Blanchard), Pierre Chomel (p.s. with Louis Le Bon, 1643), Georges Cuvier (autograph letter, 1824; with 2 handwritten notes and a portrait), Francis Darwin (1882 to Dr. Blanchard), Jean-Baptiste Dumas (2), Pierre Flourens Sr. (handwritten note on the observation of “phenomena of vitality” in animals through electricity), Wilhelm His (Leipzig 1889), Maurice Lelièvre (declaration of non-Jewish status, 1942), Lemonnier (Meudon Observatory, 1880), Urbain Le Verrier (1847), Franz Leydig (Bonn 1878), Henry Liouville (1876), Edme Mentelle (to Du Fresne, regarding a map that cannot be published due to lack of funds), Elie Metchnikoff (1888), Étienne Mulsant (printed note on H.F. Donzel with a letter, 1853), Christian Ludwig Nitzsch (Halle 1822), Jean Perrin (printed pamphlet *The Liberation of Humanity through Science*, 1936, with a letter of acknowledgment), Jean Rostand, Abbé Sicard (1819, thanking him for sending *Original Poems of the Troubadours*). Included are: – a handwritten note on “Pascal’s amulet”; a manuscript on “Artificial Meadows” by J.B. Dubois (circa 1800, 7 pp., folio); – a sign-in sheet with 56 signatures (Ampère, Boissonade, Burnouf, Cuvier, J.B. Say, Magendie, Thénard, etc.); – a diploma from the Académie de l’Industrie for Dr. Duchesne, 1837, signed by César Moreau and the Duke of Montmorency; – a diploma from the Paris Anthropological Society for Dr. Ribell, 1866, signed by Bertillon, Broca, etc.; – 2 boxes from the 37th Congress of Learned Societies, etc.