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Jean Louis Armand de Quatrefages de Bréau

Jean Louis Armand de Quatrefages de Bréau is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Jean Louis Armand de Quatrefages de Bréau rather than just read about it. In short: Jean Louis Armand de Quatrefages de Bréau (10 February 1810 – 12 January 1892) was a French physician, zoologist and anthropologist. Life Quatrefages was born on 10 February 1810 in the French commune of Valleraugue, the son of a Protestant farmer.

Jean Louis Armand de Quatrefages de Bréau — main illustration
Jean Louis Armand de Quatrefages de Bréau — illustration

Key takeaways

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Reference excerpt

Jean Louis Armand de Quatrefages de Bréau (10 February 1810 – 12 January 1892) was a French physician, zoologist and anthropologist.

Life Quatrefages was born on 10 February 1810 in the French commune of Valleraugue, the son of a Protestant farmer. He studied science and then medicine at the University of Strasbourg, where he took the double degree of Doctor of Medicine and Doctor of Science, one of his theses being a Théorie d'un coup de canon (November 1829); next year he published a book, Sur les arolithes, and in 1832 a treatise on L'Extraversion de la vessie. Moving to Toulouse, he practised medicine for a short time, and contributed various memoirs to the local Journal de Médecine and to the Annales des sciences naturelles (1834–36). But being unable to continue his research in the provinces, he resigned the chair of zoology to which he had been appointed, and in 1839 settled in Paris, where he found in Henri Milne-Edwards a patron and a friend. Elected professor of natural history at the Lycée Napoléon in 1850, he became a member of the French Academy of Sciences in 1852, and in 1855 was appointed to the chair of anthropology and ethnography at the Museum National d'Histoire Naturelle. Other distinctions followed rapidly, and continued to the end of his otherwise uneventful career, the more important being honorary member of the Royal Society of London (June 1879), member of the Institute and of the Academie de médecine, and commander of the Legion of Honor (1881). In 1891, he was elected an International Member of the American Philosophical Society. He died in Paris.

Evolution Quatrefages was critical of Charles Darwin's theories but was not anti-evolution. From 1859 he corresponded with Darwin regularly and although they disagreed with each other they stayed on friendly terms. Quatrefages authored Charles Darwin et ses précurseurs français (1870), which contained criticism of Darwinism. On receiving the book, Darwin in a letter to Quatrefages commented that "many of your strictures are severe enough, but all are given with perfect courtesy & fairness. I can truly say I would rather be criticised by you in this manner than praised by many others." In 1870, Quatrefages and Henri Milne-Edwards nominated Darwin for election as a corresponding member of the French Academy of Sciences in the section of Anatomy and Zoology. This was met with strong opposition from Émile Blanchard, Charles-Philippe Robin and others. Darwin lost the election by a narrow margin. In his book L'Espèce humaine (translated The Human Species, 1879) he disputed the role of natural selection in evolution. Quatrefages proposed that natural "elimination" would have been a more exact term as natural selection does not create new species. Quatrefages was a strict monogenist and was an opponent of polygenism.

Works

The work of de Quatrefages ranged over the whole field of zoology from the annelids and other low organisms to the anthropoids and man. Of his numerous essays in scientific periodicals, the more important were:

Considérations sur les caractères zoologiques des rongeurs (1840) De l'organisation des animaux sans vertèbres des Côtes de la Manche (Ann. Sc. Nat., 1844) Recherches sur le système nerveux, l'embryognie, les organes des sens, et la circulation des annélides (Ibid., 1844–50) Sur les affinités et les analogies des lombrics et des sangsues (Ibid.) Sur l'histoire naturelle des tarets (Ibid., 1848–49) Then there is the vast series issued under the general title of Etudes sur les types inférieurs de l'embranchement des annelés, and the results of several scientific expeditions to the Atlantic and Mediterranean coastlands, Italy and Sicily, forming a series of articles in the Revue des deux mondes, or embodied in the Souvenirs d'un naturaliste (2 vols., 1854). These were followed in quick succession by the:

Physiologie comparée, métamorphoses de l'homme et des animaux (1862) Les Polynésiens et leurs migrations (1866) Histoire naturelle des Annelés marins et d'eau douce (2 vols., 1866) La Rochelle et ses environs (1866) Rapport sur les progrés de l'anthropologie (1867) Charles Darwin et ses précurseurs francais (1870), a study of evolution in which the writer takes somewhat the same attitude as Alfred Russel Wallace, combating the Darwinian doctrine in its application to man La Race prussienne (1871) Crania Ethnica, jointly with Ernest Hamy (2 vols., with 100 plates, 1875–82), a classical work based on French and foreign anthropological data, analogous to the Crania of John Thurnam and Joseph Barnard Davis, and to Samuel George Morton's Crania Americana and Crania Aegyptiaca. L'Espèce humaine (1877) The Human Species (1879) Nouvelles études sur la distribution géographique des Négritos (1882) Hommes fossiles et hommes sauvages (1884) Histoire générale des races humaines (2 vols., 1886–89), the first volume being introductory, while the second attempts a complete classification of mankind. Les Pygmées: Avec 31 fig. intercalées dans le texte; Les Pygmées des anciens d'après la science moderne; negritos ou Pygmées asiatiques; Négrilles ou Pygmées africains; Hottentots et Boschismans (1887) Les émulés de Darwin (2 vols., 1894)

References

Other sources Limoges, Camille (1981). "Quatrefages de Bréau, Jean Louis Armand de". Dictionary of scientific biography. Vol. 11. Charles Scribner's Sons. This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Quatrefages de Bréau, Jean Louis Armand de". Encyclopædia Britannica. Vol. 22 (11th ed.). Cambridge University Press. pp. 723–724. IDREF.fr (lengthy bibliography).

External links Works by or about Jean Louis Armand de Quatrefages de Bréau at the Internet Archive La Race Prussienne (1871) at The Internet Archive Works by or about Jean Louis Armand de Quatrefages de Bréau at the Internet Archive

Illustrations

Jean Louis Armand de Quatrefages de Bréau illustration

Worked examples

Example 1 — a first encounter with Jean Louis Armand de Quatrefages de Bréau

Start with the simplest possible case. Write down what Jean Louis Armand de Quatrefages de Bréau claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Jean Louis Armand de Quatrefages de Bréau before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Jean Louis Armand de Quatrefages de Bréau ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Jean Louis Armand de Quatrefages de Bréau

In research
Jean Louis Armand de Quatrefages de Bréau appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Jean Louis Armand de Quatrefages de Bréau in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Jean Louis Armand de Quatrefages de Bréau is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1810 births, 1892 deaths, 19th-century French biologists, so understanding it makes those chapters shorter.
In everyday life
Look for Jean Louis Armand de Quatrefages de Bréau outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Jean Louis Armand de Quatrefages de Bréau in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Jean Louis Armand de Quatrefages de Bréau means in your own words.
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  4. Work through the three examples above with pen and paper.
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Frequently asked questions

What is Jean Louis Armand de Quatrefages de Bréau in simple terms?

Jean Louis Armand de Quatrefages de Bréau (10 February 1810 – 12 January 1892) was a French physician, zoologist and anthropologist. Life Quatrefages was born on 10 February 1810 in the French commune of Valleraugue, the son of a Protestant farmer.

Why does Jean Louis Armand de Quatrefages de Bréau matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Jean Louis Armand de Quatrefages de Bréau?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Jean Louis Armand de Quatrefages de Bréau.

Tags

  • 1810 births
  • 1892 deaths
  • 19th-century French biologists
  • Academic staff of the University of Toulouse
  • Commanders of the Legion of Honour
  • Foreign members of the Royal Society
  • French Calvinist and Reformed Christians
  • French fellows of the Royal Society
  • French naturalists
  • French recipients of the Legion of Honour
  • International members of the American Philosophical Society
  • Members of the French Academy of Sciences

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