|Covid-19|November 4 – The first issue of scientific journal Nature is published in London, edited by Norman Lockyer.
March 6 – Dmitri Mendeleev makes a formal presentation of his periodic table to the Russian Chemical Society.
June 15 – John Wesley Hyatt patents celluloid, in Albany, New York.
German chemist Lothar Meyer makes in his work „Die Natur der chemischen Elemente als Funktion ihrer Atomgewichte" a formal presentation of his revised and expanded version of his 1864 table independently periodic table.
Hippolyte Mège-Mouriès patents margarine (as oleomargarine) in France as a beef tallow and skimmed milk substitute for butter.
Publication of Adolphe Wurtz's Dictionnaire de chimie pure et appliquée begins in Paris.
April 6 – The American Museum of Natural History is founded in New York.
Paul Langerhans discovers the pancreatic islets.
Friedrich Miescher discovers deoxyribonucleic acid (DNA) in the pus of discarded surgical bandages. Found in the nuclei of cells, Miescher names it "nuclein".
French missionary and naturalist Père Armand David receives the skin of a giant panda from a hunter, the first time this species has become known to a Westerner; he also first describes a specimen of the "pocket handkerchief tree", which will be named in his honor as Davidia involucrata.
Alfred Russel Wallace publishes The Malay Archipelago.
W. Stanley Jevons publishes The Substitution of Similars and has a "Logic Piano" constructed to work out problems in symbolic logic.
Hermann Schwarz devizes Schwarz–Christoffel mapping.
Copley Medal: Henri Victor Regnault
Wollaston Medal for Geology: Henry Clifton Sorby
February 14 – C. T. R. Wilson (died 1959), Scottish winner of the Nobel Prize in Physics.
April 8 – Harvey Cushing (died 1939), American neurosurgeon.
July 18 – Maria von Linden (died 1936), German bacteriologist and zoologist.
August 23 – Robert Gunther (died 1940), English historian of science.
October 3 – Robert W. Paul (died 1943), English pioneer of cinematography.
December 16 – Bertha Lamme (died 1943), American electrical engineer.
Helen Boyle (died 1957), British physician and psychologist.
July 22 – John A. Roebling (born 1806), German American bridge engineer.
September 11 – Thomas Graham (born 1805), Scottish chemist.
1869 in science Wikipedia
The year 1869 in science and technology involved some significant events, listed below.