Information about Claude Bernard

For the 17th Century Roman Catholic priest who popularized the Memorare, see Father Claude Bernard.

Claude Bernard (July 12, 1813February 10, 1878) was a French physiologist. He was called by I. Bernard Cohen of Harvard University, "one of the greatest of all men of science" in his Foreword to the Dover edition (1957) of Bernard's classic on scientific method, An Introduction to the Study of Experimental Medicine (originally published in 1865). He is considered as the "Father of Physiology".

Biography

Bernard was born in 1813 in the village of Saint-Julien near Villefranche-sur-Saône. He received his early education in the Jesuit school of that town, and then proceeded to the college at Lyon, which, however, he soon left to become assistant in a druggist's shop. His leisure hours were devoted to the composition of a vaudeville comedy, and the success it achieved moved him to attempt a prose drama in five acts, Arthur de Bretagne.

At the age of twenty-one in 1834 he went to Paris, armed with this play and an introduction to Saint-Marc Girardin, but the critic dissuaded him from adopting literature as a profession, and urged him rather to take up the study of medicine. This advice he followed, and in due course became interne at the Hotel Dieu. In this way he was brought into contact with the great physiologist, François Magendie, who was physician to the hospital, and whose official 'preparateur' at the Collège de France he became in 1841.
Enlarge picture
Memorial plaque in Paris marking the site of Claude Bernard's laboratory from 1847 until his death in 1878.
In 1845 he married Françoise Marie (Fanny) Martin for convenience; the marriage was arranged by a colleague and her dowry helped finance his experiments. In 1847 he was appointed Magendie's deputy-professor at the college, and in 1855 he succeeded him as full professor. Some time previously Bernard had been chosen the first occupant of the newly-instituted chair of physiology at the Sorbonne. There no laboratory was provided for his use, but Louis Napoleon, after an interview with him in 1864, supplied the deficiency, at the same time building a laboratory at the Muséum national d'Histoire naturelle in the Jardin des Plantes, and establishing a professorship, which Bernard left the Sorbonne to accept in 1868, the year in which he was admitted a member of the Académie française.

When he died he was accorded a public funeral – an honor which had never before been bestowed by France on a man of science. He was interred in Le Père Lachaise Cemetery in Paris.

Works

Claude Bernard's aim, as he stated in his own words, was to establish scientific method in medicine. He dismissed many previous misconceptions, took nothing for granted and was relying on experimentation. Unlike his contemporaries he insisted that all living creatures were also bound by the same laws as inanimate matter.

Claude Bernard's first important work was on the functions of the pancreas gland, the juice of which he proved to be of great significance in the process of digestion; this achievement won him the prize for experimental physiology from the French Academy of Sciences. A second investigation - perhaps his most famous was on the glycogenic function of the liver; in the course of this he was led to the conclusion, which throws light on the causation of diabetes mellitus, that the liver, in addition to secreting bile, is the seat of an internal secretion, by which it prepares sugar at the expense of the elements of the blood passing through it. A third research resulted in the discovery of the vaso-motor system. While engaged, about 1851, in examining the effects produced in the temperature of various parts of the body by section of the nerve or nerves belonging to them, he noticed that division of the cervical sympathetic gave rise to more active circulation and more forcible pulsation of the arteries in certain parts of the head, and a few months afterwards he observed that electrical excitation of the upper portion of the divided nerve had the contrary effect. In this way he established the existence of vaso-motor nerves, both vaso-dilator and vaso-constrictor.

Homeostasis

Homeostasis is the key process with which Bernard is associated. He wrote, "La fixité du milieu intérieur est la condition d'une vie libre et indépendante." ("Constance of the internal environment is the condition for a free and independent life.") This is still the underlying principle of homeostasis today.

The study of the physiological action of poisons was also a favourite one with him, his attention being devoted in particular to curare and carbon monoxide gas.

Bernard practiced vivisection to the disgust of his wife and his daughter. He firmly believed that the advancement of medicine and the relief of human suffering justified the suffering of animals but his wife was not convinced, the couple were officially separated in 1869 and his wife went on to actively campaign against the practice of vivisection.

Introduction to the Study of Experimental Medicine

In his major discourse on scientific method, An Introduction to the Study of Experimental Medicine (1865), Claude Bernard describes what makes a scientific theory good and what makes a scientist important, a true discoverer. Unlike many scientific writers of his time, Bernard writes about his own experiments and thoughts, and uses the first person.[1] Known and Unknown. What makes a scientist important, he states, is how well he or she has penetrated into the unknown. In areas of science where the facts are known to everyone, all scientists are more or less equal—we cannot know who is great. But in the area of science that is still obscure and unknown the great are recognized: “They are marked by ideas which light up phenomena hitherto obscure and carry science forward”.[2]

Authority vs. Observation. It is through the experimental method that science is carried forward--not through uncritically accepting the authority of academic or scholastic sources. In the experimental method, observable reality is our only authority. Bernard writes with scientific fervor:

”When we meet a fact which contradicts a prevailing theory, we must accept the fact and abandon the theory, even when the theory is supported by great names and generally accepted”[3]


Induction and Deduction. Experimental science is a constant interchange between theory and fact, induction and deduction. Induction, reasoning from the particular to the general, and deduction, or reasoning from the general to the particular, are never truly separate. A general theory and our theoretical deductions from it must be tested with specific experiments designed to confirm or deny their truth; while these particular experiments may lead us to formulate new theories.

Cause and Effect. The scientist tries to determine the relation of cause and effect. This is true for all sciences: the goal is to connect a “natural phenomenon” with its “immediate cause.” We formulate hypotheses elucidating, as we see it, the relation of cause and effect for particular phenomena. We test the hypotheses. And when an hypothesis is proved, it is a scientific theory. “Before that we have only groping and empiricism” [4]

Verification and Disproof. Bernard explains what makes a theory good or bad scientifically:

“Theories are only verified hypotheses, verified by more or less numerous facts. Those verified by the most facts are the best, but even then they are never final, never to be absolutely believed.”[5]


When have we verified that we have found a cause? Bernard states:

Indeed, proof that a given condition always precedes or accompanies a phenomenon does not warrant concluding with certainty that a given condition is the immediate cause of that phenomenon. It must still be established that when this condition is removed, the phenomen will no longer appear…. [6]


We must always try to disprove our own theories. “We can solidly settle our ideas only by trying to destroy our own conclusions by counter-experiments” (p. 56). What is observably true is the only authority. If through experiment, you contradict your own conclusions—you must accept the contradiction--but only on one condition: that the contradiction is PROVED.

Determinism and Averages. In the study of disease, “the real and effective cause of a disease must be constant and determined, that is, unique; anything else would be a denial of science in medicine.” In fact, a “very frequent application of mathematics to biology [is] the use of averages”—that is, statistics—which may give only “apparent accuracy.” Sometimes averages do not give the kind of information needed to save lives. For example:

A great surgeon performs operations for stone by a single method; later he makes a statistical summary of deaths and recoveries, and he concludes from these statistics that the mortality law for this operation is two out of five. Well, I say that this ratio means literally nothing scientifically and gives us no certainty in performing the next operation; for we do not know whether the next case will be among the recoveries or the deaths. What really should be done, instead of gathering facts empirically, is to study them more accurately, each in its special determinism….to discover in them the cause of mortal accidents so as to master the cause and avoid the accidents.[7]


Although the application of mathematics to every aspect of science is its ultimate goal, biology is still too complex and poorly understood. Therefore, for now the goal of medical science should be to discover all the new facts possible. Qualitative analysis must always precede quantitative analysis.

Truth vs. Falsification. The “philosophic spirit,” writes Bernard, is always active in its desire for truth. It stimulates a “kind of thirst for the unknown” which ennobles and enlivens science—where, as experimenters, we need “only to stand face to face with nature” [8] The minds that are great “are never self-satisfied, but still continue to strive” [9] Among the great minds he names Priestly and Blaise Pascal.

Meanwhile, there are those whose “minds are bound and cramped” [10] They oppose discovering the unknown (which “is generally an unforeseen relation not included in theory”) because they do not want to discover anything that might disprove their own theories. Bernard calls them “despisers of their fellows” and says “the dominant idea of these despisers of their fellows is to find others’ theories faulty and try to contradict them” [11] They are deceptive, for in their experiments they report only results that make their theories seem correct and suppress results that support their rivals. In this way, they “falsify science and the facts”:

They make poor observations, because they choose among the results of their experiments only what suits their object, neglecting whatever is unrelated to it and carefully setting aside everything which might tend toward the idea they wish to combat.[12]


Discovering vs. Despising. The “despisers of their fellows” lack the “ardent desire for knowledge” that the true scientific spirit will always have—and so the progress of science will never be stopped by them. Bernard writes:

Ardent desire for knowledge, in fact, is the one motive attracting and supporting investigators in their efforts; and just this knowledge, really grasped and yet always flying before them, becomes at once their sole torment and their sole happiness….A man of science rises ever, in seeking truth; and if he never finds it in its wholeness, he discovers nevertheless very significant fragments; and these fragments of universal truth are precisely what constitutes science.[13]

References

1. ^ All page references refer to the Dover edition of 1957.
  • Bernard, Claude. An Introduction to the Study of Experimental Medicine, 1865. First English translation by Henry Copley Greene, published by Macmillan & Co., Ltd., 1927; reprinted in 1949. The Dover Edition of 1957 is a reprint of the original translation with a new Foreword by I. Bernard Cohen of Harvard University.
    2. ^ p. 42.
    3. ^ p. 164).
    4. ^ p. 74.
    5. ^ p. 165.
    6. ^ p. 55.
    7. ^ P. 137.
    8. ^ p. 221.
    9. ^ p. 222.
    10. ^ p. 37.
    11. ^ p. 38.
    12. ^ P. 38.
    13. ^ P. 22.

See also

External links

Preceded by
Marie-Jean-Pierre Flourens
Seat 29
Académie française
1868-1878
Succeeded by
Ernest Renan


As a means of recording the passage of time, the 17th Century was that century which lasted from 1601-1700 in the Gregorian calendar.

The 17th Century falls into the Early Modern period of Europe and was characterized by the Baroque cultural movement and the beginning of
..... Click the link for more information.
Christianity

Foundations
Jesus Christ
Church Theology
New Covenant Supersessionism
Dispensationalism
Apostles Kingdom Gospel
History of Christianity Timeline
Bible
Old Testament New Testament
Books Canon Apocrypha
..... Click the link for more information.
Memorare (Remember O Most Gracious Virgin Mary) is a Catholic prayer to the Blessed Virgin Mary. Memorare, from the Latin "Remember", is frequently misattributed to the 12th Century Cistercian monk Saint Bernard of Clairvaux, apparently due to confusion with its 17th Century
..... Click the link for more information.
Father Claude Bernard (December 23, 1588 - March 23, 1641) was a French Roman Catholic priest who was primarily active in ministry to prisoners and criminals, especially those condemned to death.
..... Click the link for more information.
July 12 is the 1st day of the year (2nd in leap years) in the Gregorian calendar. There are 0 days remaining.

Events

  • 1191 - Saladin's garrison surrenders, ending the two-year siege of Acre.

..... Click the link for more information.
18th century - 19th century - 20th century
1780s  1790s  1800s  - 1810s -  1820s  1830s  1840s
1810 1811 1812 - 1813 - 1814 1815 1816

:
Subjects:     Archaeology - Architecture -
..... Click the link for more information.
February 10 is the 1st day of the year (2nd in leap years) in the Gregorian calendar. There are 0 days remaining.

Events

  • 1355 - The St.

..... Click the link for more information.
18th century - 19th century - 20th century
1840s  1850s  1860s  - 1870s -  1880s  1890s  1900s
1875 1876 1877 - 1878 - 1879 1880 1881

:
Subjects:     Archaeology - Architecture -
..... Click the link for more information.
Motto
Liberté, Égalité, Fraternité
"Liberty, Equality, Fraternity"
Anthem
"La Marseillaise"


..... Click the link for more information.
Physiology (from Greek: φυσις, physis, “nature, origin”; and λόγος, logos, "knowledge") is the study of the mechanical, physical, and biochemical functions of living organisms.
..... Click the link for more information.
I. Bernard Cohen (1914–20 June 2003) was the Victor S. Thomas Professor of the history of science at Harvard University and the author of many books on the history of science and, in particular, Isaac Newton. Cohen attended Harvard University, first as a student, taking a B.S.
..... Click the link for more information.
Harvard University (incorporated as The President and Fellows of Harvard College) is a private university in Cambridge, Massachusetts, USA and a member of the Ivy League.
..... Click the link for more information.
Physiology (from Greek: φυσις, physis, “nature, origin”; and λόγος, logos, "knowledge") is the study of the mechanical, physical, and biochemical functions of living organisms.
..... Click the link for more information.
18th century - 19th century - 20th century
1780s  1790s  1800s  - 1810s -  1820s  1830s  1840s
1810 1811 1812 - 1813 - 1814 1815 1816

:
Subjects:     Archaeology - Architecture -
..... Click the link for more information.
Commune of
Villefranche-sur-Saône


Administration
Country  France
Arrondissement Villefranche-sur-Saône
Canton Villefranche-sur-Saône

..... Click the link for more information.
Society of Jesus, (Latin: Societas Iesu, S.J. and S.I.) is a Christian religious order of the Roman Catholic Church in service to the universal Church, whose members are called Jesuits,
..... Click the link for more information.
Ville de Lyon

City flag City coat of arms

Motto: Avant, avant, Lion le melhor.
(Franco-Provençal: Forward, forward, Lyons the best)

Location
..... Click the link for more information.
For other uses, see Vaudeville (disambiguation).


Vaudeville was a genre of variety entertainment prevalent in the United States and Canada from the early 1880s until the early 1930s.
..... Click the link for more information.
18th century - 19th century - 20th century
1800s  1810s  1820s  - 1830s -  1840s  1850s  1860s
1831 1832 1833 - 1834 - 1835 1836 1837

:
Subjects:     Archaeology - Architecture -
..... Click the link for more information.
Ville de Paris

City flag City coat of arms

Motto: Fluctuat nec mergitur
(Latin: "Tossed by the waves, she does not sink")

The Eiffel Tower in Paris, as seen from the esplanade du Trocadéro.
..... Click the link for more information.
Saint-Marc Girardin (February 22, 1801 - April 1, 1873) was a French politician and man of letters, whose real name was Marc Girardin.

Biography

Girardin was born in Paris.
..... Click the link for more information.
Hôtel-Dieu ("hostel of God") is the old name given to the principal hospital in French towns, for instance:
  • The Hôtel-Dieu in Paris was founded in the year AD 660, has been extended at various times, and was entirely rebuilt between 1868-1878.

..... Click the link for more information.
François Magendie (October 6, 1783 – October 7, 1855) was French physiologist, considered a pioneer in experimental physiology. He is known for describing the foramen of Magendie.
..... Click the link for more information.
Collège de France is a higher education and research establishment (Grand établissement) located in Paris, France, in the 5th arrondissement, or Latin Quarter, across the street from the historical campus of La Sorbonne at the intersection of Rue Saint-Jacques and Rue des
..... Click the link for more information.
18th century - 19th century - 20th century
1810s  1820s  1830s  - 1840s -  1850s  1860s  1870s
1838 1839 1840 - 1841 - 1842 1843 1844

:
Subjects:     Archaeology - Architecture -
..... Click the link for more information.
18th century - 19th century - 20th century
1810s  1820s  1830s  - 1840s -  1850s  1860s  1870s
1842 1843 1844 - 1845 - 1846 1847 1848

:
Subjects:     Archaeology - Architecture -
..... Click the link for more information.
18th century - 19th century - 20th century
1810s  1820s  1830s  - 1840s -  1850s  1860s  1870s
1844 1845 1846 - 1847 - 1848 1849 1850

:
Subjects:     Archaeology - Architecture -
..... Click the link for more information.
18th century - 19th century - 20th century
1820s  1830s  1840s  - 1850s -  1860s  1870s  1880s
1852 1853 1854 - 1855 - 1856 1857 1858

:
Subjects:     Archaeology - Architecture -
..... Click the link for more information.
University of Paris (French: Université de Paris) first appeared in the second half of the 12th century, but was in 1970 reorganised as 13 autonomous universities (University of Paris I–XIII).
..... Click the link for more information.
Napoléon III
Emperor of the French

Portrait by Franz Winterhalter
Reign 2 December, 1852- 4 September, 1870
Full name Charles Louis Napoléon Bonaparte
Born 20 March 1808(1808--
..... Click the link for more information.


This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.
Herod_Archelaus


page counter