Julien Offray de La Mettrie trained as a physician and was strongly influenced by the Leiden medical school, which emphasized observation and anatomy. This background helped push him toward explaining human behavior and thought in physical (bodily) terms rather than spiritual ones. That medical perspective later became central to his arguments about the mind and the body.
In 1745, La Mettrie published Histoire naturelle de l’âme (“Natural History of the Soul”), arguing that mental life depends on the body and the nervous system. The work provoked strong backlash and was publicly burned, signaling that his materialist approach had crossed political and religious boundaries. This controversy pushed him toward exile and more radical statements.
After the reaction to his 1745 book, La Mettrie left France and took refuge in the Netherlands. The move placed him in a lively publishing environment where controversial works could appear more easily than in Paris. It also set the stage for his most famous text, which would soon test Dutch tolerance as well.
Around 1747–1748, La Mettrie circulated L’Homme machine (“Man a Machine”), extending the idea of mechanistic explanations from animals to humans. He argued that thinking and feeling are functions of the organized body, not signs of an immaterial soul separate from matter. The book became a landmark statement of Enlightenment materialism and a direct challenge to mind–body dualism.
In 1748, Frederick II (“Frederick the Great”) welcomed La Mettrie to Berlin, bringing him into a circle that valued French-language learning and debate. La Mettrie was made a court reader and linked to the Prussian Academy, which helped stabilize his position. This patronage allowed his materialist ideas to continue circulating despite earlier bans.
Dutch officials in Leiden ordered L’Homme machine to be burned, reflecting how provocative its atheistic and strongly materialist claims seemed to many authorities. The suppression showed that even relatively open publishing centers had limits when religious and civic order appeared threatened. The episode also intensified La Mettrie’s personal risk and instability as a writer.
After the crackdown in the Netherlands, La Mettrie left and resettled in Prussia. This move mattered because it connected him to a court environment that could offer protection to controversial thinkers. It also shifted his work from survival through publishing to survival through patronage.
In Berlin, La Mettrie expanded his program beyond mind–body theory into ethics in Discours sur le bonheur (also known as Anti-Sénèque). He treated happiness as rooted in human nature and bodily organization, rather than as obedience to religious or ascetic ideals. This helped connect his mechanistic view of persons to a broader worldview about how people should live.
In 1751, La Mettrie’s earlier Histoire naturelle de l’âme was retitled Traité de l’âme (“Treatise on the Soul”), reflecting how the work was being organized and re-presented alongside his later writings. The shift in title did not soften the core claim: mental life should be explained through the body’s structure and function. It shows how his project was becoming a connected system rather than a single scandalous book.
La Mettrie died in Berlin on November 11, 1751. His death ended a brief but highly controversial career, shaped by censorship, exile, and court protection. By this point, Man a Machine had already become a defining text for debates about whether mind is anything more than matter in motion.
In the early 1750s, La Mettrie’s writings were gathered and reissued in collected formats, helping them persist beyond the immediate scandals of the 1740s. This mattered because the collected texts let readers see Man a Machine alongside related works on the soul, animals, and happiness as one connected materialist program. The collections also made it easier for supporters and critics to respond to him as a system-builder rather than a single-book provocateur.
In 1752, Frederick II wrote an Éloge (eulogy) for La Mettrie, attempting to defend his reputation and highlight his intellectual contribution. The eulogy signaled that La Mettrie’s ideas had influential protectors even when many religious and philosophical authorities rejected them. As a closing outcome, it shows how Man a Machine moved from a censored scandal into a lasting reference point in debates about materialism and the nature of mind.
Julien Offray de La Mettrie and 'Man a Machine' (1748–1751)