6 h 51 minAudiobook9 minSummaryRead it, hear it, the 15-minute summary, and print and large print at cost
Audiobook edition · 6 h 51 minPaperback · 6 × 9 in · printing soonHardcover · 6 × 9 in · printing soonAbout this book
What if the soul is not separate from the body, but a name for what the brain does?
In Man a Machine, French physician Julien Offray de La Mettrie makes a bold case: a human being is a self-moving machine. He starts with what bodies reveal. Illness and diet change how we think and feel. For him, these observations matter more than grand theories about the soul.
This short philosophical treatise follows the argument from the senses and education to apes and clockwork figures. La Mettrie asks readers to trust experience, and to stop where observation stops. At stake is how we understand thought itself—and what his account of the mind leaves for religion and morals.
What you’ll discover
- The mind follows the body Explore the claim that changes in bodily health bring changes in thought and feeling.
- Experience before grand theories Meet a physician who puts observation ahead of inherited explanations of the soul.
- Thought takes shape Follow La Mettrie's account of how the senses and education build our ideas.
- A machine with living springs Consider his vivid image of a body that keeps its own machinery moving.
- The soul under question Examine his provocative claim that the soul names the thinking work of the brain.
Who will love it
You will enjoy this book if you love bold arguments, the history of science and medicine, the Enlightenment, or the old question of how mind and body fit together.
What’s inside
The key ideas, in the 15-minute summary
- A doctor turns his sickbed into philosophy
- Illness, sleep, and drugs show the soul depends on the body
- Food, climate, and temperament shape character
- Men and animals differ in degree, not in kind
- Words and imagination build the human mind
- Natural law is a feeling shared with animals
- Belief in God is left open and set aside
- Matter moves itself, as living tissue shows
- The machine need not be cruel, and may be happy
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L’Homme-machine
by Julien Offray de La Mettrie · 1747
A French army doctor claims the soul is the body at work, and offers frogs' hearts and watches as proof.
Challenging5–10 hours to readfrançais
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In short
A soldier in the trench sleeps through the thunder of a hundred cannon. A bomb is about to land, yet his soul hears nothing.
From the 15-minute summary · Key idea 1
A doctor turns his sickbed into philosophy
La Mettrie trained as a physician under Boerhaave, and his book comes from the sickroom, not the lecture hall. He says the argument must begin with what a doctor sees at a bedside. His aim is blunt: to show that thought belongs to the living body.
Before he starts, he sorts earlier thinkers into two camps. Materialists say there is only matter. Spiritualists say the soul is a separate thing. He pushes aside the followers of Descartes, who count two substances in man as if they had seen them.
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Which edition is right for me
- 15-minute summary
- The key ideas of the whole book in about 9 minutes. A good first look, or a refresher.
Details
- First published
- 1747
- Language
- français
- Level
- Challenging
Cite this edition
La Mettrie, Julien Offray de. Man a Machine. Library of Alexandria, 2026, libraryofalexandria.com/products/man-a-machine.
La Mettrie, J. O. de. (2026). Man a machine. Library of Alexandria. https://libraryofalexandria.com/products/man-a-machine (Original work published 1747)
La Mettrie, Julien Offray de. Man a Machine. Library of Alexandria, 2026. https://libraryofalexandria.com/products/man-a-machine.
@book{lamettrie2026man,
author = {La Mettrie, Julien Offray de},
title = {Man a Machine},
publisher = {Library of Alexandria},
year = {2026},
url = {https://libraryofalexandria.com/products/man-a-machine},
note = {First published 1747}
}
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What is Man a Machine about?
It argues that the human soul is the working of the living body, especially the brain. La Mettrie uses cases from medicine and anatomy, from fever and sleep to animal hearts, to claim that thought depends on organised matter.
What does La Mettrie mean by calling man a machine?
He means a self-moving organism made of parts that act on each other, like a watch whose wheels keep running. Feeling and thought are properties of that organisation, not a separate spirit living inside it.
When was Man a Machine written and why was it controversial?
It was printed at Leyden in 1748. Its claim that the soul depends on the body, and its doubts about proofs of God, angered religious authorities, and La Mettrie later found refuge at the Prussian court.
The author
Julien Offray de La Mettrie
1709–1751 · French physician and philosopher
Julien Offray de La Mettrie was a French physician and philosopher born in Saint-Malo in 1709. He wrote philosophical works in the 1740s, including Man a Machine. He lived in France and the Netherlands before moving to Prussia in 1748. He died in Berlin in 1751.
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