Historical Events
- Oct 1 News of the World begins publication in London
- Oct 13 B'nai B'rith founded (NY)
- Oct 14 British arrest Irish nationalist Daniel O'Connell for conspiracy
- Oct 16 Sir William Rowan Hamilton comes up with the idea of quaternions, a non-commutative extension of complex numbers.
- Oct 20 1st Chinese immigrant arrives in Suriname
Famous Birthdays
- Oct 20 Victor de Stuers, Dutch art connoisseur
- Oct 21 Mark M Antokolski, Russian/French sculptor (Peter the Great)
- Oct 22 Stephen Babcock, Oneida County New York, American Agricultural Chemist (Babcock test and father of scientific dairying)
- Oct 25 Gleb Uspensky, Russian author (Power of the Soil), born in Tula, Russian Empire (d. 1902)
- Oct 26 Vasily Vereshchagin, Russian painter (War & Peace), born in Cherepovets, Russia (d. 1904)
- Oct 30 A G Henri Regnault, French water colors painter
Famous Deaths
- Oct 10 Karl Theodor Toeschi, composer, dies at 75