The Variation of Animals and Plants under Domestication
Charles Darwin's 1868 two-volume study of domestic variation — the work in which the much-criticised theory of "pangenesis" (inheritance through "gemmules") appeared
Tradition: Nineteenth-century evolutionary biology
Domestic variation and the now-discarded theory of pangenesis — Darwin's major treatment of inheritance, ten years after Origin
The Variation of Animals and Plants under Domestication (1868) is Darwin's two-volume study of domestic variation in plants and animals — his major treatment of inheritance, ten years after Origin. The work catalogues variations across many domesticated species (pigeons, dogs, cattle, horses, etc.), discusses the mechanisms of variation, and (controversially) advances the theory of "pangenesis" — that inheritance operates through "gemmules" given off by all body cells, accumulating in the germ cells, and transmitting characteristics including acquired ones. Pangenesis was widely criticised in Darwin's lifetime and was rejected by Mendel's subsequent genetics; the book is now read more for its empirical content than for the theoretical framework.
Author
Editions cited
- The Variation of Animals and Plants under Domestication (John Murray, 1868; revised 1875); modern critical edition Cambridge UP, 2010
School Embodiments
Major nineteenth-century evolutionary-naturalist work on inheritance and variation.
"The variations seen in domesticated plants and animals are the most extensive variations we have careful records of, and they must inform any general theory of inheritance." (Variation, Preface)
Extensive empirical-comparative data across many domesticated species.
"I have collected data on pigeons over decades; the variations are extreme, and they have arisen from a single ancestor through selective breeding." (Variation)
Realist about variation, heredity, and the actual conditions of artificial selection.
"What artificial selection has produced in pigeons and dogs in centuries, natural selection could produce in much longer periods in wild populations." (Variation)
Identifies underlying generative mechanisms (selective breeding, heritable variation) that produce the visible diversity.
"Behind the visible diversity must lie a mechanism that produces and transmits heritable variation; pangenesis is my conjecture about that mechanism." (Variation)
Systematic-theoretical framework — pangenesis as inferential extrapolation from observational data.
"From the observed patterns of inheritance, we must reason backward to the underlying mechanism — pangenesis is my proposed reconstruction." (Variation)
Practical-realist about agricultural-breeding implications.
"The breeder's art shows what selection can accomplish; the principles he applies unconsciously are the principles theoretical biology must articulate." (Variation)
The framework of continuous variation and transmission anticipates process-biological frameworks.
"Variation is continuous and ongoing; species are not fixed but in process." (Variation)
Internal Tensions
Pangenesis was widely criticised in Darwin's lifetime (Jenkin's 1867 "blending inheritance" objection had been a major problem for Darwin) and was rejected by Mendel's subsequent genetics. The book's scientific reputation suffered through the early twentieth century before being rehabilitated for its empirical achievement.
I. Time
The centuries of artificial selection that produced domestic varieties; the longer evolutionary time of natural selection.
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II. Space
The British and continental agricultural-breeding establishments Darwin studied.
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III. Matter
The embodied domestic plants and animals whose variations the work catalogues.
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IV. Observer
Darwin as inheritance-theorist drawing on extensive breeder reports.
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V. Energy
The generative-reproductive energies that produce and transmit variation.
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VI. Information
The catalogue of variations; the (eventually discarded) pangenesis theory.
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Personas with the nearest attribute fingerprint
Historical figures whose own classification on the same six-dimensional grid lands closest to this work's. Computed by attribute-agreement on coordinates both address.
Computed school proximity
The work's attribute fingerprint scored against all schools using the same quiz scorer. Useful as a sanity check on the hand-curated embodiments above.
How The Variation of Animals and Plants under Domestication resolves each dilemma
51 resolved positions across 4 dimensions, including 6 distinctive where the majority of schools go the other way · 6 unaligned.
Each dimension is sorted so minority positions come first. Mainstream positions are folded into an expandable list.
Time · 9 dilemmas · 3 distinctive
Persistence, the future, and the direction of becoming.
6 mainstream positions
Matter · 7 dilemmas, all mainstream
Observer · 37 dilemmas · 3 distinctive
Mind, agency, and the knower's relation to the known.