'Principles of Geology': the Earth's past explained by causes now in operation and by vast time
A method of explaining the past of the Earth by the same causes that act today: slow uplift and subsidence, erosion, volcanoes, rather than catastrophes. This requires spans of time incomparably longer than the earlier geology allowed.
The method is set out in the 'Principles of Geology' (three volumes, 1830-1833) by the Englishman Charles Lyell. The book was about landforms and strata, and its author rejected the transmutation of species until the late 1850s.
It was here that two naturalists took what selection cannot work without: the idea of accumulated small changes and of deep time. Darwin carried the first volume aboard the Beagle and wrote that his books came 'half out of Lyell's brains'; Wallace argued with the anti-evolutionary chapters of the Principles in his papers of 1855 and 1858.
Why this date
The date follows the first volume of 'Principles of Geology, being an attempt to explain the former changes of the Earth's surface, by reference to causes now in operation' (London, John Murray), published in July 1830; the second volume was finished in December 1831 and the third in April 1833 (Britannica). The title and year of the first volume were checked against record A505.1 at Darwin Online.
What grew out of it
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'On the Origin of Species': natural selection as the mechanism of species formation
influenced · Confidence: high
Lyell gave Darwin not a theory of species but a way of thinking: to explain the past by slow present causes and to allow incomparably long time; Darwin carried the first volume on the Beagle, wrote that his books came 'half out of Lyell's brains', and in the Origin invited anyone who does not admit the vastness of past ages to close the book.
Dispute: The influence is not contested, but its nature is discussed. The Principles of Geology contain neither evolution nor selection: the second volume explicitly refutes Lamarck, and Lyell, according to Britannica, 'had never shared his protégé's belief in evolution' up to 1859. The link therefore runs through method (actualism, the accumulation of small changes) and through deep time, not through the content of the theory. Sloan assigns the Lyellian explanation to a 'predominantly anglophone historiography' (Hodge, Herbert) and sets against it the social-constructivist line (Young) that derives Darwin from political economy, and recent work that has lowered the estimate of the novelty of his views.
Link sources
- Phillip Sloan, Darwin: From the Origin of Species to the Descent of Man, Stanford Encyclopedia of Philosophy (2019) Verified 20 Sep 2026
His conversion to the uniformitarian geology of Charles Lyell and to Lyell's advocacy of "deep" geological time during the voyage of the HMS Beagle (December 1831–October 1836), has been seen as fundamental in his formation (Norman 2013; Herbert 2005; Hodge 1983).
- Charles Lyell, Encyclopaedia Britannica (Richard W. Macomber) (2024)
Although Darwin drew heavily on Lyell's Principles of Geology both for style and content, Lyell had never shared his protégé's belief in evolution.
- Charles Darwin, Evolution by natural selection: the London years, 1836-42, Encyclopaedia Britannica (Adrian J. Desmond) (2026) Verified 24 Sep 2026
That was the way a species kept pace with the Lyellian evolution of Earth.
- Nora Barlow (ed.), The Autobiography of Charles Darwin 1809-1882, London: Collins, p. 77 (Darwin Online, F1497) (1958) Verified 20 Sep 2026
I had brought with me the first volume of Lyell's Principles of Geology, which I studied attentively; and this book was of the highest service to me in many ways.
- Charles Darwin to Leonard Horner, 29 August [1844], Darwin Correspondence Project, DCP-LETT-771 (1844) Verified 5 Oct 2026
I always feel as if my books came half out of Lyell's brains & that I never acknowledge this sufficiently, nor do I know how I can, without saying so in so many words
- Charles Darwin, On the Origin of Species, 1st ed., chapter IX, p. 282 (Darwin Online, F373) (1859) Verified 20 Sep 2026
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.
"Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.
- Phillip Sloan, Darwin: From the Origin of Species to the Descent of Man, Stanford Encyclopedia of Philosophy (2019) Verified 20 Sep 2026
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Wallace, 'On the Tendency of Varieties to Depart Indefinitely from the Original Type': natural selection found independently
influenced · Confidence: high
Wallace read Lyell in the 1840s, and Costa shows that the papers of 1855 and 1858 were written as a reply to the anti-transmutation chapters of the Principles of Geology: Lyell was for Wallace both a source and an opponent, and Darwin was cast as the intermediary through whom the paper was to reach Lyell.
Dispute: Costa's thesis of Lyell as the 'chief addressee' of the Ternate paper is recent (2013) and not generally accepted: the usual account (Britannica, the Darwin Correspondence Project) sees Lyell and Hooker only as the organisers of the 1858 reading. Smith (2014) accepts Costa's point that Wallace had his own reason to seek a conversation with Lyell (the dispute over the biogeography of Aru) but disputes that the sentence about Lyell in 'My Life' proves the letter to Darwin was a reply to news of Lyell's approval. Lyell's influence on Wallace's reading of the 1840s (McKinney) is itself not contested.
Link sources
- James T. Costa, Engaging with Lyell: Alfred Russel Wallace's Sarawak Law and Ternate papers as reactions to Charles Lyell's Principles of Geology, Theory in Biosciences 132 (4), 225-237 (2013) Verified 5 Oct 2026
This narrative has resulted in an under-appreciation of a more central role for Charles Lyell as both Wallace's inspiration and foil. The extensive anti-transmutation arguments in Lyell's landmark Principles of Geology were taken as the definitive statement on the subject. Wallace, in his quest to solve the mystery of species origins, engaged with Lyell's arguments in his private field notebooks in a way that is concordant with his engagement with Lyell in the 1855 and 1858 papers.
- James T. Costa, Engaging with Lyell: Alfred Russel Wallace's Sarawak Law and Ternate papers as reactions to Charles Lyell's Principles of Geology, Theory in Biosciences 132 (4), 225-237 (2013) Verified 5 Oct 2026
I show that Lyell was the object of Wallace's Sarawak Law and Ternate papers through a consideration of the circumstances that led Wallace to send his Ternate paper to Darwin, together with an analysis of the material that Wallace drew upon from the Principles. In this view Darwin was, ironically, intended for a supporting role in mediating Wallace's attempted dialog with Lyell.
- H. Lewis McKinney, Wallace, Alfred Russel, Complete Dictionary of Scientific Biography (1976) Verified 20 Sep 2026
indeed, during the period from 1842 to 1846, he consumed various works by Alexander von Humboldt, T. R. Malthus, Charles Darwin, Robert Chambers, Charles Lyell, and William Swainson. These books profoundly influenced his subsequent intellectual development
- A. R. Wallace, My Life: A Record of Events and Opinions, London: Chapman & Hall, vol. 1, pp. 361-363 (1905) Verified 20 Sep 2026
I asked him if he thought it sufficiently important to show it to Sir Charles Lyell, who had thought so highly of my former paper.
"Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.
- James T. Costa, Engaging with Lyell: Alfred Russel Wallace's Sarawak Law and Ternate papers as reactions to Charles Lyell's Principles of Geology, Theory in Biosciences 132 (4), 225-237 (2013) Verified 5 Oct 2026
Node sources
- Charles Lyell, Encyclopaedia Britannica (Richard W. Macomber) (2024) Verified 24 Sep 2026
Returning to London, he set to work immediately on his book, Principles of Geology, the first volume of which was published in July 1830.
- Charles Lyell, Encyclopaedia Britannica (Richard W. Macomber) (2024) Verified 24 Sep 2026
Back in London he set to work again on the Principles of Geology, finishing Volume II in December 1831 and the third and final volume in April 1833.
- Charles Lyell, Encyclopaedia Britannica (Richard W. Macomber) (2024) Verified 24 Sep 2026
he found striking confirmation of his belief in the adequacy of natural causes to explain the features of the Earth and in the great antiquity even of such a recent feature as Etna itself.
- Charles Lyell, Principles of geology, being an attempt to explain the former changes of the Earth's surface, by reference to causes now in operation, vol. 1, London: John Murray (1830)
Principles of geology, being an attempt to explain the former changes of the Earth's surface, by reference to causes now in operation.
- Charles Darwin, Evolution, Natural Selection, Beagle Voyage, Encyclopaedia Britannica (Adrian J. Desmond) (2026) Verified 24 Sep 2026
Lyell, taking the uniformitarian position, had argued that geologic formations were the result of steady cumulative forces of the sort we see today.
- Charles Darwin to Leonard Horner, 29 August [1844], Darwin Correspondence Project, DCP-LETT-771 (1844) Verified 5 Oct 2026
I always feel as if my books came half out of Lyell's brains & that I never acknowledge this sufficiently, nor do I know how I can, without saying so in so many words
- James T. Costa, Engaging with Lyell: Alfred Russel Wallace's Sarawak Law and Ternate papers as reactions to Charles Lyell's Principles of Geology, Theory in Biosciences 132 (4), 225-237 (2013) Verified 5 Oct 2026
This narrative has resulted in an under-appreciation of a more central role for Charles Lyell as both Wallace's inspiration and foil. The extensive anti-transmutation arguments in Lyell's landmark Principles of Geology were taken as the definitive statement on the subject. Wallace, in his quest to solve the mystery of species origins, engaged with Lyell's arguments in his private field notebooks in a way that is concordant with his engagement with Lyell in the 1855 and 1858 papers.
- James T. Costa, Engaging with Lyell: Alfred Russel Wallace's Sarawak Law and Ternate papers as reactions to Charles Lyell's Principles of Geology, Theory in Biosciences 132 (4), 225-237 (2013) Verified 5 Oct 2026
I show that Lyell was the object of Wallace's Sarawak Law and Ternate papers through a consideration of the circumstances that led Wallace to send his Ternate paper to Darwin, together with an analysis of the material that Wallace drew upon from the Principles. In this view Darwin was, ironically, intended for a supporting role in mediating Wallace's attempted dialog with Lyell.
"Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.