Jean-Baptiste Lamarck

Jean-Baptiste de Lamarck

1744 — 1829

Première République française, royaume de France, Premier Empire français, Restauration

SciencesScientifiqueEarly ModernLate 18th and early 19th century (Revolutionary and Napoleonic era)

French naturalist and zoologist (1744–1829), Lamarck developed a theory of evolution based on the adaptation of organisms to their environment and the inheritance of acquired characteristics. A professor at the Paris Museum of Natural History, he laid the foundations of transformism, a precursory vision of evolution predating Darwin.

Émotions disponibles (6)

Neutre

par défaut

Inspiré

Pensif

Surpris

Triste

Fier

Key Facts

1778: Appointed as a botanist at the Paris Museum of Natural History
1809: Publication of Philosophie Zoologique, outlining his theory of transformism and the inheritance of acquired characteristics
1815–1822: Writes Natural History of Invertebrate Animals, a comprehensive work of zoological synthesis
1829: Dies in Paris, nearly ignored and forgotten, his theories discredited by Cuvier and the fixist school
Late 19th–20th century: Rediscovery of his work following the publication of Darwin's On the Origin of Species (1859)

Works & Achievements

Flore française (1778)

A botanical work in three volumes proposing a dichotomous method for identifying plants, revolutionary for its time. It earned Lamarck his scientific reputation and his admission to the Académie des sciences.

Système des animaux sans vertèbres (1801)

Lamarck's first major zoological work, laying the foundations for a modern classification of invertebrates. He introduces for the first time ideas on the progressive transformation of species.

Hydrogéologie (1802)

An essay on the slow transformation of the Earth's surface by water, in which Lamarck argues for an extremely ancient Earth. He also coins the term 'biology' in this work.

Philosophie zoologique (1809)

Lamarck's theoretical masterpiece, setting out his law of use and disuse of organs and the inheritance of acquired characteristics. It is the first systematic exposition of a theory of species evolution.

Histoire naturelle des animaux sans vertèbres (1815-1822)

A seven-volume encyclopedia devoted to invertebrates, the product of twenty years of work at the Muséum. A monumental work of classification that remained a reference for several decades.

Anecdotes

Lamarck was originally a renowned botanist, author of a monumental 'Flore française' in 1778. It was Count Buffon, director of the Jardin du Roi, who recommended him for this work. Yet, at the age of 49, he was appointed professor of zoology at the new Muséum national d'Histoire naturelle… for invertebrates, a field he barely knew. He rose to the challenge brilliantly and ultimately revolutionized biology.

It was Lamarck himself who coined the word 'biology' in 1802, to designate the science of living beings. He used the term almost simultaneously with the German naturalist Gottfried Reinhold Treviranus, but independently. This word, now universal, is one of his least-known contributions to the general public.

Lamarck died blind and in near-total destitution in 1829. His daughter Cornélie had stayed by his side until the end, reading to him and transcribing his final reflections. His belongings were auctioned off to pay his debts, and he was buried in a common grave. It was only decades later that science paid him tribute with a statue at the Muséum d'Histoire naturelle.

When Napoleon received the 'Tableau encyclopédique et méthodique' in 1809, Lamarck hoped for encouragement. But the Emperor, leafing through the work, said to him contemptuously: 'It is your old age that I pity.' Lamarck burst into tears. Napoleon favored sciences useful to war and industry, not philosophical zoology.

Lamarck was one of the first scholars to propose that the Earth was very old — far older than the biblical texts suggested. He estimated that the transformation of species required millions of years, a radical idea for his time, long before geologists such as Lyell popularized the concept.

Primary Sources

Philosophie Zoologique (1809)

Circumstances influence the form and organization of animals, that is to say, when circumstances become very different, they bring about, over time, proportional changes in the form and organization of animals.

Système des Animaux sans Vertèbres (1801)

I believed it necessary, in this work, to present invertebrate animals from a general perspective, distributing them into the classes that suit them according to their organization.

Hydrogéologie (1802)

Time has no limits for nature; it is man alone who feels the necessity of it, because his duration is bounded. For nature, there is neither beginning nor end.

Natural History of Invertebrate Animals (vol. 1, introduction) (1815)

Life is but a physical phenomenon; all the facts it presents to us are mechanical, physical, and chemical results of organization, and consequently natural effects.

Key Places

Muséum national d'Histoire naturelle, Paris

Lamarck's main workplace for thirty years. It was in its galleries and laboratories that he classified invertebrates and developed his theory of evolution.

Jardin des Plantes, Paris

Attached to the Muséum, this botanical and zoological garden was Lamarck's daily setting. He observed living plants and animals there, feeding his naturalist thinking.

Bazentin, Picardie

Lamarck's birthplace in 1744. This rural village in the Somme, far from Paris, reflects his modest origins as the youngest son of a minor noble family.

Académie des sciences, Paris

Institution where Lamarck was elected a member in 1779 thanks to his 'Flore française'. It was also there that his rival Georges Cuvier delivered his ambiguous and reductive eulogy after Lamarck's death.

Typical Objects

Compound microscope

An indispensable instrument for the 18th-century naturalist to observe invertebrates and 'microscopic animals'. Lamarck used it at the Muséum to study the minute organisms he had to classify.

Herbarium and botanical plates

Lamarck began his career as a botanist: he assembled carefully pressed and annotated herbaria, which formed the basis of his 'Flore française'. These collections were the scholar's material memory.

Mollusc shells

Lamarck was a world expert on both fossil and living shells, and contributed to founding invertebrate palaeontology. He compared living and fossil species to support his transformist theories.

Goose quill and inkwell

The scholar's everyday tools, with which Lamarck wrote thousands of pages of classification and theory. After he lost his sight, it was his daughter Cornélie who held the quill in his place.

Jars of alcohol-preserved specimens

The Muséum d'Histoire Naturelle kept thousands of animals in jars of alcohol. Lamarck relied on these collections to establish his classifications of invertebrates.

Copper-mounted magnifying glass

Before losing his sight, Lamarck used a magnifying glass to examine small invertebrates. This simple but precious tool symbolises the meticulous observation at the heart of his scientific approach.

School Curriculum

LycéeSVT

LycéeSVT — Histoire et théories de l'évolution

LycéeSVT — Comparaison entre le transformisme lamarckien et le darwinisme

LycéeSVT — Les mécanismes d'adaptation des êtres vivants à leur environnement

LycéeSVT — La controverse scientifique : fixisme versus transformisme au XIXe siècle

LycéeSVT — Les débuts de la paléontologie et de la zoologie modernes

LycéeSVT — La transmission des caractères et les origines de la génétique

Vocabulary & Tags

Key Vocabulary

transformisminheritance of acquired characteristicsadaptationevolutionfixismorganismenvironmentzoological classification

Daily Life

Morning

Lamarck rose early and devoted his mornings to observation and classification in the galleries of the Muséum. He examined specimens preserved in the collections, took meticulous notes, and occasionally received young naturalists or travelers bringing back exotic animals.

Afternoon

The afternoon was reserved for writing his works and his public lectures, which he gave free of charge at the Muséum. He also walked through the greenhouses and the botanical garden to observe living plants, fuel his reflections on adaptation, and test his theories against direct observation.

Evening

In the evenings, in his modest Parisian apartment, Lamarck read, reflected, and dictated to his daughter Cornélie as his eyesight declined. His income was meager and his evenings often studious but solitary, far from the brilliant salons frequented by his more prosperous contemporaries.

Food

Like most scholars of modest means, Lamarck ate simply: soups, vegetables, bread, and ordinary cuts of meat. The end of his life was marked by genuine poverty that reduced his meals to the bare minimum.

Clothing

Lamarck wore the sober attire of a learned bourgeois of the late 18th century: a coat with lapels, breeches or trousers depending on the era, a white cravat, a powdered wig in his youth and then natural hair under the Empire. Nothing extravagant — a reflection of his always precarious financial circumstances.

Housing

Lamarck lived in modest Parisian apartments, close to the Muséum. His lodgings were cluttered with books, notes, specimens, and collected shells — a scholar's cabinet more than a comfortable home. At the end of his life, he lived in almost complete destitution.

Historical Timeline

1744Naissance de Jean-Baptiste de Monet, chevalier de Lamarck, à Bazentin (Picardie), dans une famille noble mais modeste.

1778Publication de la 'Flore française', qui lui vaut une réputation nationale et l'entrée à l'Académie des sciences.

1789Début de la Révolution française : les institutions scientifiques royales sont réformées, le Jardin du Roi devient le Muséum national d'Histoire naturelle.

1793Création du Muséum national d'Histoire naturelle ; Lamarck y est nommé professeur de zoologie des 'insectes, vers et animaux microscopiques'.

1799Bonaparte prend le pouvoir lors du coup d'État du 18 Brumaire, instaurant le Consulat puis l'Empire — contexte peu favorable aux sciences spéculatives.

1801Lamarck publie le 'Système des animaux sans vertèbres', première grande synthèse zoologique sur les invertébrés, et y ébauche ses idées transformistes.

1802Il forge le mot 'biologie' et publie 'Hydrogéologie', où il défend une vision d'une Terre très ancienne soumise à des transformations lentes et continues.

1809Publication de la 'Philosophie zoologique', œuvre maîtresse exposant sa théorie de l'évolution par l'usage, le non-usage et la transmission des caractères acquis.

1815Début de la publication de l''Histoire naturelle des animaux sans vertèbres' (7 volumes, achevée en 1822), somme encyclopédique monumentale.

1818Lamarck perd la vue définitivement ; il continue de dicter ses travaux à sa fille Cornélie malgré la cécité et la pauvreté croissante.

1829Mort de Lamarck à Paris dans la misère. Ses théories sont alors peu reconnues par ses contemporains, notamment par Cuvier, son rival influent.

1859Darwin publie 'De l'origine des espèces' ; la postérité réévaluera le rôle précurseur de Lamarck dans l'histoire de la théorie de l'évolution.

Period Vocabulary

Transformism — Theory according to which living species gradually transform over time under the influence of their environment. This is the term used to describe Lamarck's ideas, as opposed to fixism, which asserted the immutability of species.

Invertebrates — Term coined by Lamarck himself to designate all animals lacking a vertebral column — insects, mollusks, worms, etc. Before him, such animals were simply referred to as 'inferior' or 'spineless' animals.

Acquired characteristics — According to Lamarck, bodily modifications that an animal develops during its lifetime in response to its environment, which would then be passed on to its descendants. This central concept of his system was later refuted by modern biology.

Fixism — The dominant doctrine in Lamarck's time, championed notably by Cuvier, according to which species were created as they are and do not change. Lamarck directly opposed this view.

Muséum d'Histoire naturelle — National scientific institution created in 1793 in Paris, successor to the Jardin du Roi. It brought together specialized professors responsible for research, collections, and free public education.

Biology — Term coined by Lamarck in 1802 (and nearly simultaneously in Germany) to designate the science of living beings as a whole, distinct from botany or zoology. This word is now universal.

Law of use and disuse — Lamarck's first law: frequent use of an organ develops and strengthens it, while disuse causes it to atrophy and gradually disappear. The giraffe stretching its neck to reach leaves is the classic illustration, often caricatured.

Naturalist — A scholar who studies nature as a whole: animals, plants, minerals. In the 18th century, the naturalist was simultaneously a botanist, zoologist, and geologist, before these disciplines became specialized in the 19th century.

Species — The fundamental unit of classification of living things. The question of the fixity or transformation of species over time was at the heart of the debate between Lamarck (transformist) and Cuvier (fixist) at the beginning of the 19th century.

Gallery

Jean-Baptiste de Monet Chevalier de Lamarck (1744-1829)label QS:Len,"Jean-Baptiste de Monet Chevalier de Lamarck (1744-1829)"

Jean Baptiste Pierre Antoine de Monet Lamarck (detail). Stip

The story of nineteenth-century science

Statue of Jean-Baptiste Lamarck by Léon Fagel high relief

Statue of Lamarck @ Jardin des Plantes @ Paris (30844527781)

Statue of Jean-Baptiste Lamarck (32956787752)

Statue de Jean-Baptiste Lamarck par Léon Fagel au Jardin des plantes à Paris le 3 avril 2017 - 07

Statue de Jean-Baptiste Lamarck par Léon Fagel au Jardin des plantes à Paris le 3 avril 2017 - 14

History of Biology

Visual Style

Illustration naturaliste néoclassique en gravure au trait, tons sépia et ocre, évoquant les planches encyclopédiques et le cabinet de curiosités savant du début du XIXe siècle.

#C8A96E

#4A3728

#D4C5A9

#2E4A2E

#8B7355

AI Prompt

Neoclassical scientific illustration style of early 19th century France. Engraved anatomical and zoological plates with fine cross-hatching, precise ink line work on cream parchment paper. Natural history cabinet interior with wooden specimen shelves, glass jars, fossils and shells arranged systematically. Muted earthy palette of ochre, sepia, ivory and forest green. Scientific instruments — magnifying glass, quill, compass — on a cluttered scholar's desk. Soft candlelight and grey Parisian daylight through tall windows. Inspired by the visual aesthetic of the Encyclopédie and the engravings of the Muséum d'Histoire naturelle.

Sound Ambience

L'atmosphère sonore du cabinet de travail de Lamarck au Muséum : silence studieux ponctué du grattement de la plume, des bruits de collections manipulées et des rumeurs lointaines du Jardin des Plantes.

AI Prompt

Ambient sounds of a 19th century Parisian natural history museum: distant footsteps on stone floors, the scratch of a quill pen on paper, the clinking of glass specimen jars being arranged on wooden shelves, muffled voices of scholars in discussion, rustling of large botanical illustration pages, the occasional call of exotic birds from the nearby menagerie at the Jardin des Plantes, horse-drawn carriages passing outside on cobblestone streets, the soft crackle of a fireplace in a scholarly cabinet, rain pattering on tall windows overlooking the garden.

Portrait Source

Wikimedia Commons — domaine public — Charles Thévenin — 1802