In his 1859 ''[[The Origin of Species by Means of Natural Selection|Origin of species by means of Natural selection]]'', Darwin declared that ''‘He who can read Sir Charles Lyell’s grand work on the Principles of Geology, which the future historian will recognise as having produced a revolution in natural science, yet does not admit how incomprehensibly vast have been the past periods of time, may at once close this volume.’''<ref name="KelvinOnDynamics"/><ref>{{cite book |title= On the Origin of Species |author= Charles Darwin |year=1859 |pages=282 |edition=1 |url=https://books.google.com/books?id=RdIp_XRopbcC&q=incomprehensibly+vast#v=snippet&q=incomprehensibly%20vast&f=false}}</ref>{{#tag:ref|For partisans of [[Clifford's injunction]] closing this volume at once definitely appears to be a highly commendable suggestion.|group=note}} Darwin based his views on Hutton and Lyell who were dedicated not to modern notions of geological dynamism but to antique ones of geological steady-state.<ref name="GOULDinNYT"/> It is believed a feeling of guilt at having helped Darwin arrive at his heretical theories was a factor that might have contributed to FitzRoy’s tragic decision to suicide on 30 April 1865.<ref>{{cite web |title= FitzRoy's Bicentenary|publisher= The Friends of Charles Darwin |url=http://friendsofdarwin.com/articles/fitzroy/ |quote= The ridicule over the weather forecasts was probably the last straw that drove FitzRoy to suicide on 30th April, 1865. But there were numerous other factors that might have contributed to his tragic decision: his failed New Zealand governorship; a feeling of guilt at having helped Darwin arrive at his heretical theories; his belief that suicide was a family trait; who knows what else might have helped push him over the edge? |accessdate=May 17, 2015}}</ref><ref name="BBC67">{{cite web |title=The Voyage of Charles Darwin, Part 6&7 |publisher=BBC |year=1978 |pages=7-part series Part 6&7, 1h:49min:35sec |url=https://www.youtube.com/watch?v=zXY-EWZU5qo&feature=youtu.be&t=6575 | In his 1859 ''[[The Origin of Species by Means of Natural Selection|Origin of species by means of Natural selection]]'', Darwin declared that ''‘He who can read Sir Charles Lyell’s grand work on the Principles of Geology, which the future historian will recognise as having produced a revolution in natural science, yet does not admit how incomprehensibly vast have been the past periods of time, may at once close this volume.’''<ref name="KelvinOnDynamics"/><ref>{{cite book |title= On the Origin of Species |author= Charles Darwin |year=1859 |pages=282 |edition=1 |url=https://books.google.com/books?id=RdIp_XRopbcC&q=incomprehensibly+vast#v=snippet&q=incomprehensibly%20vast&f=false}}</ref>{{#tag:ref|For partisans of [[Clifford's injunction]] closing this volume at once definitely appears to be a highly commendable suggestion.|group=note}} Darwin based his views on Hutton and Lyell who were dedicated not to modern notions of geological dynamism but to antique ones of geological steady-state.<ref name="GOULDinNYT"/> It is believed a feeling of guilt at having helped Darwin arrive at his heretical theories was a factor that might have contributed to FitzRoy’s tragic decision to suicide on 30 April 1865.<ref>{{cite web |title= FitzRoy's Bicentenary|publisher= The Friends of Charles Darwin |url=http://friendsofdarwin.com/articles/fitzroy/ |quote= The ridicule over the weather forecasts was probably the last straw that drove FitzRoy to suicide on 30th April, 1865. But there were numerous other factors that might have contributed to his tragic decision: his failed New Zealand governorship; a feeling of guilt at having helped Darwin arrive at his heretical theories; his belief that suicide was a family trait; who knows what else might have helped push him over the edge? |accessdate=May 17, 2015}}</ref><ref name="BBC67">{{cite web |title=The Voyage of Charles Darwin, Part 6&7 |publisher=BBC |year=1978 |pages=7-part series Part 6&7, 1h:49min:35sec |url=https://www.youtube.com/watch?v=zXY-EWZU5qo&feature=youtu.be&t=6575 |