<a href="https://en.wikipedia.org/wiki/Charles_Darwin" id="mwTQ" rel="mw:WikiLink" title="Charles Darwin">Charles Darwin</a> embarks on <a href="https://en.wikipedia.org/wiki/Second_voyage_of_HMS_Beagle" id="mwTg" rel="mw:WikiLink" title="Second voyage of HMS Beagle">his journey</a> aboard <a about="#mwt51" data-mw='{"parts":[{"template":{"target":{"wt":"HMS","href":"./Template:HMS"},"params":{"1":{"wt":"Beagle"}},"i":0}}]}' href="https://en.wikipedia.org/wiki/HMS_Beagle" id="mwTw" rel="mw:WikiLink" title="HMS Beagle" typeof="mw:Transclusion">HMS<span typeof="mw:Entity"> </span><i>Beagle</i></a>, during which he will begin to formulate his theory of <a href="https://en.wikipedia.org/wiki/Evolution" id="mwUA" rel="mw:WikiLink" title="Evolution">evolution</a>.<sup about="#mwt55" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-8"}}' id="cite_ref-8" rel="dc:references" typeof="mw:Extension/ref"><a href="./December_27#cite_note-8" id="mwUQ" style="counter-reset: mw-Ref 8;"><span class="mw-reflink-text" id="mwUg">[8]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-8"><cite about="#mwt52" class="citation book cs1" id="CITEREFHelm2018">Helm, Glenn E. (2018). "<i id="mwB5s">Beagle</i>, Voyage of (1831-1836)". In Doyle, Mark (ed.). <a class="external text" href="https://books.google.com/books?id=2fJgDwAAQBAJ" id="mwB5w" rel="mw:ExtLink nofollow"><i id="mwB50">The British Empire: A Historical Encyclopedia. Vol. 2</i></a>. Santa Barbara, Calif.: ABC-CLIO. p.<span id="mwB54" typeof="mw:Entity"> </span>4. <a class="mw-redirect" href="./ISBN_(identifier)" id="mwB58" rel="mw:WikiLink" title="ISBN (identifier)">ISBN</a><span id="mwB6A" typeof="mw:Entity"> </span><a href="./Special:BookSources/9781440841972" id="mwB6E" rel="mw:WikiLink" title="Special:BookSources/9781440841972"><bdi id="mwB6I">9781440841972</bdi></a>.</cite><span about="#mwt52" class="Z3988" id="mwB6M" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=bookitem&amp;rft.atitle=Beagle%2C+Voyage+of+%281831-1836%29&amp;rft.btitle=The+British+Empire%3A+A+Historical+Encyclopedia.+Vol.+2&amp;rft.place=Santa+Barbara%2C+Calif.&amp;rft.pages=4&amp;rft.pub=ABC-CLIO&amp;rft.date=2018&amp;rft.isbn=9781440841972&amp;rft.aulast=Helm&amp;rft.aufirst=Glenn+E.&amp;rft_id=https%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D2fJgDwAAQBAJ&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3ADecember+27"></span></span>