1860 in science

Astronomy

• July 18 – Total solar eclipse. Warren De La Rue's photographs of this event, taken in Spain, together with those of Angelo Secchi, demonstrate the solar character of the prominences or red flames seen around the limb of the moon during such an eclipse.

Biology

• June 30 – Debate about evolution at the new Oxford University Museum of Natural History.
• John Curtis publishes in Glasgow.

  Botany

• Joseph Dalton Hooker concludes publication of The Botany of the Antarctic Voyage of H.M. Discovery Ships Erebus and Terror... 1839–1843 with issue of the final part of Flora Tasmaniae in London.

  Chemistry

• September 3–5 – Karlsruhe Congress, the first international meeting of chemists.
• Marcellin Berthelot rediscovers and names acetylene.
• Robert Bunsen and Gustav Kirchhoff, using their newly improved spectroscope, discover and name caesium in mineral water from Bad Dürkheim, Germany.
• Stanislao Cannizzaro, resurrecting Avogadro's ideas regarding diatomic molecules, compiles a table of atomic weights and presents it at the 1860 Karlsruhe Congress, ending decades of conflicting atomic weights and molecular formulas, and leading to Mendeleev's discovery of the periodic law.
• Albert Niemann makes a detailed analysis of the coca leaf, isolating and purifying the crystalline alkaloid which he calls cocaine.
• The Erlenmeyer flask was created by German chemist Emil Erlenmeyer.

  Mathematics

• Carl Wilhelm Borchardt first discovers and proves Cayley's formula in graph theory.

  Medicine

• July 9 – The Nightingale Training School and Home for Nurses, the first nursing school based on the ideas of Florence Nightingale, is opened at St Thomas' Hospital in London.

  Psychology

• Gustav Fechner publishes Elemente der Psychophysik, establishing the discipline of psychophysics and introducing the Weber–Fechner law on the intensity of stimuli.

  Technology

• April 9 – Earliest known decipherable sound recording of the human voice, a phonautogram, produced by Édouard-Léon Scott de Martinville. Playback is impossible at this time.
• December 29 – Launch of HMS Warrior by the Thames Ironworks and Shipbuilding Company, the first all-iron warship, for the first time combining steam engines delivering high speed, rifled breech-loading guns, iron frames and armoured cladding, and the propeller, in the largest naval ship built to this date.

  Awards

• Copley Medal: Robert Wilhelm Bunsen
• Wollaston Medal for geology: Searles Valentine Wood

  Births

• February 29 – Herman Hollerith, American statistician, punched card data processing inventor.
• May 2
• * John Scott Haldane, Scottish physiologist.
• * D'Arcy Wentworth Thompson, Scottish biologist.
• May 25 – James McKeen Cattell, American psychologist.
• December 31 – John T. Thompson, American inventor.

  Deaths

• January 27 – János Bolyai, Hungarian mathematician.
• January 27 – Thomas Brisbane, British astronomer.
• April 1 – Joseph Guislain, Belgian psychiatrist.
• June 29 – Thomas Addison, English physician and scientist.
• July 1 – Charles Goodyear, American inventor of the vulcanization process.