* February 21 – Osborne Reynolds, Irish physicist ( b. 1842 ).

* January 21 – Calixa Lavallée, Canadian composer ( b. 1842 )

Margaretha Geertruida Zelle was born in Leeuwarden, Friesland, Netherlands, the eldest of four children of Adam Zelle ( 2 October 1840 – 13 March 1910 ) and his first wife Antje van der Meulen ( 21 April 1842 – 9 May 1891 ).

Fulton County was formed on December 21, 1842, and named for William Fulton, the last governor of the Arkansas Territory.

Various smaller scientific fragments have been collected in the editions of Johann Gottlob Schneider ( 1818 – 21 ) and Friedrich Wimmer ( 1842 — 62 ) and in Hermann Usener's Analecta Theophrastea.

# Elizabeth Grenville ( 24 October 1756 – 21 December 1842 ), who married the 1st Earl of Carysfort ( 12 August 1751 – 7 April 1828 ) on 12 April 1787 and had three daughters.

Calixa Lavallée, ( December 28, 1842 – January 21, 1891 ), born Calixte Paquet dit Lavallée, was a French-Canadian-American musician and Union Army officer during the American Civil War who composed the music for O Canada, which officially became the national anthem of Canada in 1980.

Further extensions opened to Frederick ( including the short Frederick Branch ) December 1, 1831, Point of Rocks April 2, 1832, Sandy Hook December 1, 1834 ( the connection to the Winchester and Potomac Railroad at Harpers Ferry opening in 1837 ), Martinsburg May 1842, Hancock June 1842, Cumberland November 5, 1842, Piedmont July 21, 1851, Fairmont June 22, 1852, and its terminus at Wheeling, West Virginia ( then part of Virginia ) on January 1, 1853.

Alfred G. " Alferd " Packer ( January 21, 1842 – April 23, 1907 ) was an American prospector who was accused of cannibalism during the winter of 1873-1874.

Osborne Reynolds FRS ( 23 August 1842 – 21 February 1912 ) was a prominent innovator in the understanding of fluid dynamics.

On 13 June 1842 he accompanied Pottinger on his expedition up the Yangtze River to Nanking ( Nanjing ), and witnessed the capture of Chinkiang on 21 July and witnessed the signing of the Treaty of Nanking on board the British warship HMS Cornwallis on 29 August 1842.

Richard Southwell Bourke, 6th Earl of Mayo KP, GMSI, PC ( 21 February 1822 – 8 February 1872 ), styled Lord Naas between 1842 and 1867, was a statesman and prominent member of the British Conservative Party from Dublin, Ireland.

Zhenjiang suffered from strife during the First Opium War ( 1839 – 42 ) when it was captured by the British at the Battle of Chinkiang on 21 July 1842, and again during the Taiping Rebellion ( 1850 – 1864 ).

Following a case beginning in 1983, civil unrest erupted in Wisconsin after the U. S. District Court Judge Barbara Crabb ruled on August 21, 1987 that six Ojibwe ( Chippewa ) tribal governments had the treaty right to regulate their members ' hunting and fishing outside of the reservation boundaries, based on federal treaties of 1837 and 1842.

Bertrand, comte Clausel ( or Clauzel ) ( 12 December 1772 – 21 April 1842 ) was a marshal of France.

* in Afghanistan, a kingdom entitled to a gun salute of 21 guns ( the highest rank among princely states, not then among Sovereign monarchs ): the first British Residents were Sir Alexander Burnes ( 1837 – 2 November 1841 ); William Hay McNaghten ( 7 August 1839 – 23 December 1841 ); Eldred Pottinger ( December 1841 – 6 January 1842 ). After that, four native Vakils acted on behalf of the British government: Nawab Foujdar Khan ( 1856 – April 1859 ), Ghulam Husain Khan Allizai ( April 1859 – 1865 ), Bukhiar Khan ( February 1864 – January 1868, acting ), Attah Muhammad Khan Khagwani ( January 1868 – 1878 ); then there were two more British Residents Louis Napoleon Cavagnari ( 24 July 1879 – 3 September 1879 ), Henry Lepel-Griffin ( 1880 ); next came two Military Commanders ( 8 October 1879 – 11 August 1880 ) and until 1919 ten native British Agents, one of whom served two non-consecutive terms.

Sir James Ivory ( 17 February 1765 – 21 September 1842 ) was a Scottish mathematician.

The B & O had reached Martinsburg, ( West ) Virginia by May 1842, Hancock, ( West ) Virginia, by June, Cumberland, Maryland, on November 5, 1842, Piedmont, ( West ) Virginia on July 21, 1851 and Fairmont, Virginia on June 22, 1852.

Wojciech Żywny (; May 13, 1756February 21, 1842 ) was a Czech-born Polish pianist, violinist, teacher and composer.

Emmanuel-Augustin-Dieudonné-Joseph, comte de Las Cases ( 21 June 1766 – 15 May 1842 ) was a French atlas-maker and author, famed for an admiring book on Napoleon.

On her return to Haworth, she met William Weightman ( 1814 – 1842 ), her father's new curate, who started work in the parish in August 1839.

* August 13 – Jules Massenet, French composer ( b. 1842 )

* August 26 – William James, American psychologist and philosopher ( b. 1842 )

* On August 29, 1842, the first of two Opium Wars ended between China and Britain with the Treaty of Nanking.

* The Webster-Ashburton Treaty, signed August 9, 1842, settled the dispute over the location of the Maine-New Brunswick border between the United States and Canada.

It would end three years later with the signing of the Treaty of Nanking on 29 August 1842.

* August 10 – The Mines Act 1842 becomes law, prohibiting underground work for all women and boys under 10 years old in England.

The Treaty of Nanking ( or Nanjing ) was signed on 29 August 1842 to mark the end of the First Opium War ( 1839 – 42 ) between the United Kingdom of Great Britain and Ireland and the Qing Dynasty of China.

On 29 August 1842, British representative Sir Henry Pottinger and Qing representatives, Qiying, Yilibu, and Niujian, signed the treaty.

Georgetown gained official city status on 24 August 1842 during the reign of Queen Victoria.

Emil Christian Hansen ( May 8, 1842 – August 27, 1909 ) was a Danish mycologist and fermentation physiologist.

Charles Cros ( October 1, 1842 – August 9, 1888 ) was a French poet and inventor.

Worth had declared the war to be over in August 1842, and Depot Key was abandoned by the Army after the hurricane.

Isaac Redding added a Keytesville's first hotel in August 1842.

In 1842 at age 17, Leaving the country with his sister due to a poor relationship with their stepmother, Margaret Dea his father in 1840 after the death of his mother August 22 1833.

A feeder from the River Frome to the summit level was completed in August 1842, and the canal opened in stages as it was completed, with extensions to Canon Frome wharf in January 1843, Whithington wharf in February 1844, and finally to Hereford basin on 22 May 1845.

He was granted the title of Rajah of Sarawak on 24 September 1841, partly attributed to his relationship with a daughter of the Sultan, although the official declaration was not made until 18 August 1842.

* October 17-Sven August Körling, composer of art songs ( b. 1842 )

* August 26 – Eugen Gura, opera singer ( born 1842 )

* August 17 – Edmond Audran, composer ( b. 1842 )

On 13 August 1842 there was a strike at Bayley's Cotton Mill in Stalybridge, and roving cohorts of operatives carried the stoppage first to the whole area of Stalybridge and Ashton, then to Manchester, and subsequently to towns adjacent to Manchester, using as much force as was necessary to bring mills to a standstill.

* August 26-William James, philosopher ( born 1842 )

The Webster – Ashburton Treaty, signed August 9, 1842, was a treaty resolving several border issues between the United States and the British North American colonies.