Launcelot Harrison
{{Short description|Australian zoologist and entomologist}}
{{Use Australian English|date=June 2023}}
File:Launcelot Harrison 1880-1928.png
Launcelot Harrison (13 July 1880 – 20 February 1928) was an Australian zoologist, entomologist and NSW rugby union player who held the Challis Chair in Zoology from 1922 until his untimely death from a cerebral haemorrhage.{{cite web |last1=Walsh |first1=G. P. |title=Launcelot Harrison (1880–1928) |url=https://adb.anu.edu.au/biography/harrison-launcelot-6586 |website=Australian Dictionary of Biography |publisher=National Centre of Biography, Australian National University |language=en}}{{cite web |last1=Centre for Transformative Innovation |first1=Swinburne University of Technology |title=Harrison, Launcelot – Person – Encyclopedia of Australian Science and Innovation |url=https://www.eoas.info/biogs/P001116b.htm |website=www.eoas.info |access-date=24 June 2023 |language=en-gb}}{{cite web |title=PROFESSOR HARRISON |url=https://trove.nla.gov.au/newspaper/article/16443936 |website=Sydney Morning Herald |access-date=24 June 2023 |date=22 February 1928}}
He married writer Amy Mack on 29 February 1908.{{cite web |last1=Phelan |first1=Nancy |title=Mack, Amy Eleanor (1876–1939) |url=https://adb.anu.edu.au/biography/mack-amy-eleanor-7769 |website=Australian Dictionary of Biography |publisher=National Centre of Biography, Australian National University |access-date=24 June 2023 |language=en}} His 1915 study found that host and parasite body sizes tended to positively co-vary; this finding was dubbed Harrison's rule.{{cite journal | last=Harrison | first=Launcelot | title=Mallophaga from Apteryx, and their significance; with a note on the genus Rallicola | journal=Parasitology | year=1915 | volume=8 | pages=88–100 | url=http://www.phthiraptera.info/Publications/0182.pdf | doi=10.1017/S0031182000010428 | access-date=2018-03-30 | archive-url=https://web.archive.org/web/20171107015756/http://phthiraptera.info/Publications/0182.pdf | archive-date=2017-11-07 | url-status=dead }}
During World War I he served as an advising entomologist (ranked Lieutenant) to the British Expeditionary Force in Mesopotamia.{{cite web |title=Launcelot Harrison {{!}} AustLit: Discover Australian Stories |url=https://www.austlit.edu.au/austlit/page/OLD?id=A-M%3D&idtype=oldid |website=www.austlit.edu.au |access-date=25 August 2023 |language=en}}
His students included Claire Weekes, the first woman to earn a doctorate at the University of Sydney.{{citation needed|date=June 2023}}