Alan Turing
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Alexandre Laemlein, 1858, BIU Sante, Universite Paris Cite (CIPC0168), Licence ouverte · Lithograph portrait 'Claude Bernard', signed 'Laemlein 1858', printed by Lemercier, Paris; Bibliotheque interuniversitaire de sante (BIU Sante), Universite Paris Cite, record CIPC0168 (stamp of R. Blanchard). A contemporary printed portrait made when he was 45; the holder record does not document a sitting. Digital master 2645 x 3779 pixels; this copy downscaled to 840 x 1200 (never enlarged). · Licence ouverte (Etalab) stated on the BIU Sante record; the lithograph is also public domain by age (Laemlein died 1871)
scientist · 19th Century
Claude Bernard
1813–1878
Known For
scientificmedical
Not yet included in personality matching — the documented evidence doesn't yet cover enough of the personality model. Everything else on this page is fully available.
Trait Constellation
Key Achievements
Played a major part in establishing the principles of experimentation in the life sciences, becoming one of the founders of experimental medicine; his 1865 Introduction to the Study of Experimental Medicine remains a widely read classic.
Discovered the role of pancreatic juice in digesting fats, the liver's glycogenic function and the vasomotor nerves that regulate blood supply, and showed how curare and carbon monoxide act on the body.
Developed the concept of the internal environment, the idea that the constancy of the body's internal milieu is the condition for independent life, which Britannica says led to the present understanding of homeostasis.
Moments That Reveal Them
Puzzled by the chance observation that some rabbits passed clear rather than cloudy urine, he inferred that they had not been fed and were living on their own tissues, confirmed it by feeding them meat, and an autopsy then led him to the role of the pancreas in digestion.
This is consistent with a habit of following up an unexpected observation with a testable hypothesis and a confirming experiment. Curiosity
After washing the sugar out of a freshly removed dog's liver he found that the liver was again rich in sugar a day later, and inferred that it must contain a sugar-forming substance; in 1857 he isolated pure glycogen from it.
This is consistent with an experimental style that tests a physiological idea directly on the organ and draws the next inference from the result. Experimentation
Turning Points
Forced to rest by illness from 1860, he used his convalescence of 1862-63 to draft the Introduction to the Study of Experimental Medicine, moving his emphasis from the pursuit of concrete facts to the methods and principles of biological science.
This is consistent with a shift from collecting results toward generalising them into a framework for the field. Systems Thinking
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Sources
- Claude Bernard (Q208230), verified live via the Wikidata API (2026-11-04): label 'Claude Bernard', description 'French physiologist (1813-1878)', born 1813-07-12, died 1878-02-10, citizenship France, Korean label 클로드 베르나르. Orientation only; not used as support for any row.
- Encyclopaedia Britannica, 'Claude Bernard' (Britannica Editors), article body read as served (through the sections on digestion, the liver, the vasomotor nerves, carbon monoxide and curare). CANONICAL SIGNIFICANCE SOURCE: French physiologist known chiefly for discoveries on the role of the pancreas in digestion, the glycogenic function of the liver and the regulation of the blood supply by the vasomotor nerves; one of the founders of experimental medicine who advanced beyond the vitalism and indeterminism of earlier physiologists; his most seminal contribution was the concept of the internal environment, which led to the present understanding of homeostasis; career from apothecary's apprentice and failed playwright to Magendie's assistant and deputy at the Collège de France, the chance observation of rabbits passing clear urine that led to the pancreas work, the 1856 discovery of glycogen. Scholarly modern reference.
- Complete Dictionary of Scientific Biography, entry 'Bernard, Claude' (as reproduced on Encyclopedia.com), full entry read: his work as Magendie's preparateur from 1841, the modest private laboratory in the Cour du Commerce and the neighbouring Pelouze laboratory, Magendie teaching him vivisection and suspicion of accepted doctrines, the failed teaching examination and resignation of 1844, the unsuccessful attempt at a free course, the 1847 deputyship and the 1852 chair, the discoveries (pancreatic juice and fat, the perfused liver and glycogen in 1855-57, vasodilating nerves in 1858, the milieu interieur in 1857), the shift from laboratory work to methodological synthesis in the Cahier rouge of 1850-60, the 1860-63 convalescence in which he drafted the Introduction, honours, his teaching 'science in the making', his posthumously published fermentation notes and Pasteur's angry reply ('there was truth and error on both sides'), and his criticism of Pasteur on spontaneous generation and of Virchow's cell theory. Scholarly historical dictionary; the entry's own judgments on Bernard's errors are used where cited.
- Science and Its Times, entry 'Claude Bernard' (as reproduced on Encyclopedia.com), read in full: sugar in the blood of meat-fed animals and the conversion of other substances to glucose in the liver, the concept of internal secretions and of the internal environment ('the constancy of the internal milieu is the condition for free and independent life'), the 1860 convalescence and the Introduction, the influence on Henderson and Cannon, and the note that a close examination of his research notebooks indicates the path to each discovery was much more confused and tortuous than the published accounts admit. Student-oriented reference work, independent of the Dictionary entry; the notebook remark is the counter-voice on his published method.
- Encyclopedia of Modern Europe, entry 'Bernard, Claude' (as reproduced on Encyclopedia.com), read in full: failed the agregation but his position let him do extensive research; the Rapport of 1867; the inaugural lecture to the Academie francaise seeking to reduce oppositions between materialism and spiritualism; the Introduction (1865) and its reception; the view that he regarded philosophers including Comte with quiet disdain and was suspicious of 'making a specialty of generalizations'; and that his determinism and attacks on vitalism raised criticism and debates that continue. A historiographical overview; used for the positivism and criticism points.
- Encyclopedia of World Biography, entry 'Claude Bernard' (as reproduced on Encyclopedia.com), read in full: apprenticeship and theatre ambitions, medical studies from 1834 and internship in 1839, honours, Pasteur's remark on the 1865 Introduction ('never has anything clearer, more complete, more profound, been written about the difficult art of experiment'), the starved rabbits and clear urine, the pancreatic juice and fat absorption, the washed dog liver that was again rich in sugar a day later and the isolation of glycogen in 1857, the sympathetic-nerve cuts of 1851-52, curare from 1844 and carbon monoxide, and the early errors (the function of the chorda tympani and of the nerve to the vocal cords misinterpreted). Reference biography; independent of the Dictionary entry in wording but built on the same secondary literature.
- Science Museum Group Collection, people record 'Claude Bernard 1813-1878' (biography text, read in full): a developer and teacher of experimental methods in medicine, professor of physiology in Paris, author of the influential Introduction to the Study of Experimental Medicine (1865); the museum notes that much of his work used experiments on living animals and that many people opposed the method. Short museum biography; the counter-voice on the use of vivisection (the museum's remark about his family is private life and is not used).
- Claude Bernard, Introduction a l'etude de la medecine experimentale (Paris, 1865), French original on Project Gutenberg, the passages on vivisection (part II, section III) and on the laboratory as 'the true sanctuary of medical science' read: SELF-REPORT of his own method and its defence ('without this mode of investigation there is no physiology or scientific medicine'). Self-authored; used only to show how he described his method, never as sole support for a row.
- Bibliotheque interuniversitaire de sante (BIU Sante, Universite Paris Cite), image bank record CIPC0168, 'Claude Bernard', lithograph by Alexandre Laemlein, 1858 (Licence ouverte). Holder record for the portrait only.