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离开威尔士的塞奇威克后，达尔文在巴茅斯与他的学生朋友们度过了一个星期，然后在8月29日回到家中，发现亨斯洛写了一封信，信中提议他作为一名合适的(即使未完成)博物学家，与队长罗伯特•菲茨罗伊(Robert FitzRoy)合作，成为一名自筹资金的临时职位。他强调，这是一个绅士的职位，而不是“一个纯粹的收藏家”。这艘船将在四个星期后出发，去探索南美洲的海岸线。罗伯特 · 达尔文反对他儿子计划的为期两年的航行，认为这是浪费时间，但在他姐夫约西亚 · 韦奇伍德二世的劝说下，同意(并资助)他儿子的参与。达尔文小心翼翼地以私人身份保留对自己收藏品的控制权，打算将其捐献给一个重要的科学机构。

离开威尔士的塞奇威克后，达尔文在巴茅斯与他的学生朋友们度过了一个星期，然后在8月29日回到家中，发现亨斯洛写了一封信，信中提议他作为一名合适的(即使未完成)博物学家，与队长罗伯特•菲茨罗伊(Robert FitzRoy)合作，成为一名自筹资金的临时职位。他强调，这是一个绅士的职位，而不是“一个纯粹的收藏家”。这艘船将在四个星期后出发，去探索南美洲的海岸线。罗伯特 · 达尔文反对他儿子计划的为期两年的航行，认为这是浪费时间，但在他姐夫约西亚 · 韦奇伍德二世的劝说下，同意(并资助)他儿子的参与。达尔文小心翼翼地以私人身份保留对自己收藏品的控制权，打算将其捐献给一个重要的科学机构。

[[File:Voyage of the Beagle-en.svg|thumb|upright=1.8|alt=Route from Plymouth, England, south to Cape Verde then southwest across the Atlantic to Bahia, Brazil, south to Rio de Janeiro, Montevideo, the Falkland Islands, round the tip of South America then north to Valparaiso and Callao. Northwest to the Galapagos Islands before sailing west across the Pacific to New Zealand, Sydney, Hobart in Tasmania, and King George's Sound in Western Australia. Northwest to the Keeling Islands, southwest to Mauritius and Cape Town, then northwest to Bahia and northeast back to Plymouth.|The voyage of the ''Beagle'', 1831–1836]]

[[文件:Voyage of the Beagle-en.svg|缩略图|右|猎犬号环游世界，1831-1836年]]

After leaving Sedgwick in Wales, Darwin spent a week with student friends at [[Barmouth]], then returned home on 29 August to find a letter from Henslow proposing him as a suitable (if unfinished) [[natural history|naturalist]] for a self-funded [[wikt:supernumerary|supernumerary]] place on {{HMS|Beagle}} with captain [[Robert FitzRoy]], emphasising that this was a position for a [[gentleman]] rather than "a mere collector". The ship was to leave in four weeks on an expedition to chart the coastline of South America.<ref>{{cite web|url=http://www.darwinproject.ac.uk/darwinletters/calendar/entry-105.html|title=Darwin Correspondence Project&nbsp;– Letter 105&nbsp;– Henslow, J. S. to Darwin, C. R., 24 Aug 1831|accessdate=29 December 2008|url-status=live|archiveurl=https://web.archive.org/web/20090116035549/http://www.darwinproject.ac.uk/darwinletters/calendar/entry-105.html|archivedate=16 January 2009}}</ref> [[Robert Darwin]] objected to his son's planned two-year voyage, regarding it as a waste of time, but was persuaded by his brother-in-law, [[Josiah Wedgwood II]], to agree to (and fund) his son's participation.<ref>{{Harvnb|Desmond|Moore|1991|pp= 94–97}}</ref> Darwin took care to remain in a private capacity to retain control over his collection, intending it for a major scientific institution.<ref name="Browne">{{Harvnb|Browne|1995|pp=204–210}}</ref>

After leaving Sedgwick in Wales, Darwin spent a week with student friends at [[Barmouth]], then returned home on 29 August to find a letter from Henslow proposing him as a suitable (if unfinished) [[natural history|naturalist]] for a self-funded [[wikt:supernumerary|supernumerary]] place on {{HMS|Beagle}} with captain [[Robert FitzRoy]], emphasising that this was a position for a [[gentleman]] rather than "a mere collector". The ship was to leave in four weeks on an expedition to chart the coastline of South America.<ref>{{cite web|url=http://www.darwinproject.ac.uk/darwinletters/calendar/entry-105.html|title=Darwin Correspondence Project&nbsp;– Letter 105&nbsp;– Henslow, J. S. to Darwin, C. R., 24 Aug 1831|accessdate=29 December 2008|url-status=live|archiveurl=https://web.archive.org/web/20090116035549/http://www.darwinproject.ac.uk/darwinletters/calendar/entry-105.html|archivedate=16 January 2009}}</ref> [[Robert Darwin]] objected to his son's planned two-year voyage, regarding it as a waste of time, but was persuaded by his brother-in-law, [[Josiah Wedgwood II]], to agree to (and fund) his son's participation.<ref>{{Harvnb|Desmond|Moore|1991|pp= 94–97}}</ref> Darwin took care to remain in a private capacity to retain control over his collection, intending it for a major scientific institution.<ref name="Browne">{{Harvnb|Browne|1995|pp=204–210}}</ref>

When organising his notes as the ship sailed home, Darwin wrote that, if his growing suspicions about the mockingbirds, the tortoises and the [[Falkland Islands wolf|Falkland Islands fox]] were correct, "such facts undermine the stability of Species", then cautiously added "would" before "undermine".<ref name=xix>{{Harvnb|Keynes|2000|pp=[http://darwin-online.org.uk/content/frameset?viewtype=text&itemID=F1840&pageseq=22 xix–xx]}}<br />{{Harvnb|Eldredge|2006}}</ref> He later wrote that such facts "seemed to me to throw some light on the origin of species".<ref>{{Harvnb|Darwin|1859|loc=[http://darwin-online.org.uk/content/frameset?itemID=F373&viewtype=text&pageseq=16 p. 1]}}</ref>

When organising his notes as the ship sailed home, Darwin wrote that, if his growing suspicions about the mockingbirds, the tortoises and the [[Falkland Islands wolf|Falkland Islands fox]] were correct, "such facts undermine the stability of Species", then cautiously added "would" before "undermine".<ref name=xix>{{Harvnb|Keynes|2000|pp=[http://darwin-online.org.uk/content/frameset?viewtype=text&itemID=F1840&pageseq=22 xix–xx]}}<br />{{Harvnb|Eldredge|2006}}</ref> He later wrote that such facts "seemed to me to throw some light on the origin of species".<ref>{{Harvnb|Darwin|1859|loc=[http://darwin-online.org.uk/content/frameset?itemID=F373&viewtype=text&pageseq=16 p. 1]}}</ref>

===Inception of Darwin's evolutionary theory===

===Inception of Darwin's evolutionary theory===