"Airs, Waters, Places": disease from air, waters and locality

c. 400 BCE Life and health theory theory refuted

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An ancient medical treatise instructs the physician first of all to study the seasons, the winds and the qualities of the waters of a given locality; marshy, stagnant waters with a 'strong smell' are linked in it to the diseases of the inhabitants. The authorship is attributed to Hippocrates.

This is the origin of the idea that epidemic diseases are generated by corrupted air and locality rather than by a specific agent. The idea would later be called the miasma theory; from the same logic the sanitary movement of the 19th century would grow, well before germs were found.

Why this date

approximate: Hippocratic corpus, late 5th to early 4th century BCE

What grew out of it

• Chadwick: Report on the Sanitary Condition of the Labouring Population of Great Britain

  influenced · Confidence: high

  Chadwick's sanitary reform grew out of the miasma theory: the conviction that disease comes from smell and filth produced the programme of drainage and sewerage.

  Dispute: "It worked for the wrong reason": Hempel puts it plainly: "The government was doing the right thing, albeit for the wrong reasons". Hamlin (1998) complicates this: Chadwick was not merely wrong about etiology but deliberately narrowed the explanation to "filth", excluding poverty and hunger (Corbett: "argued that the primary cause of pauperism and misery was not poverty or rampant capitalism, but filth"). Halliday adds that Chadwick's early flushing of sewage into the Thames may have intensified the cholera epidemics of 1848-1849 and 1853-1854 (full text of the article unavailable; the thesis is taken from its introduction and its well-known argument; needs checking).

  Link sources

  • Hempel S. Miasmas and Germs (British Online Archives) (2024) Verified 20 Sep 2026

    Chadwick's commitment to miasmatism led him to call for some vital reforms, including the construction of efficient drains and sewers

  • Corbett S., Hamlin 1998, Health Promotion International 14(4) (1999)

    A committed miasmatist, Chadwick attributed the cause of fever to overcrowding, reeking privvies and humid marsh air.

  • Halliday S. BMJ 2001 (2001)

    Edwin Chadwick's (1800-90) Report on the Sanitary Condition of the Labouring Population of Great Britain, published in 1842, argued for the improvement of house drainage to remove noxious smells from dwellings.

  • Kiechle M.A. Nursing Clio 2025 (2025) Verified 20 Sep 2026

    Miasma theory offered a powerful and compelling explanation of what caused disease since first explained by the ancient Greek physician Hippocrates.

  • Chadwick 1842 (1842) Verified 20 Sep 2026

    atmospheric impurities produced by decomposing animal and vegetable substances, by damp and filth, and close and overcrowded dwellings

  "Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.

Other links

• John Snow: cholera is transmitted by water (1849; Broad Street 1854; book 1855)

  refuted by · Confidence: high

  Snow rejected the atmospheric (miasmatic) explanation of cholera and showed the waterborne route of transmission; contemporaries did not accept it.

  Dispute: The refutation was not recognized in Snow's lifetime (he died in 1858): Halliday: "Dr John Snow's hypothesis of polluted water being a cause of cholera was not accepted in official circles at the time of his death in 1858". Eyler: "A major change in thinking about disease causation was needed before Snow's work could be widely accepted. William Farr's later studies contributed to that acceptance" (the 1866 epidemic in East London). Snow himself qualified the pump episode: "the attacks had so far diminished before the use of the water was stopped, that it is impossible to decide whether the well still contained the cholera poison in an active state". Brody et al. (Lancet 2000) show that the famous map was drawn after the investigation as an illustration, not as a tool of discovery (thesis from the abstract; no verbatim quotation extracted).

  Link sources

  • Snow J. 1849, p. 2 (1849)

    Reasoning by analogy from what is known of other diseases, we ought not to conclude that cholera is propagated by an effluvium

  • Snow J. «On the Mode of Communication of Cholera», 2nd ed., London: Churchill, 1855 (1855) Verified 20 Sep 2026

    I had an interview with the Board of Guardians of St. James's parish, on the evening of Thursday, 7th September, and represented the above circumstances to them. In consequence of what I said, the handle of the pump was removed on the following day.

  • Report of the Committee for Scientific Inquiries, General Board of Health 1855, p. 52, Paneth et al. 1998 (1855)

    it has been suggested by Dr. Snow, that the real cause of whatever was peculiar in the case lay in the use of one particular well, situate at Broad Street...After careful inquiry, we see no reason to adopt this belief.

  • Report of the Committee for Scientific Inquiries, General Board of Health 1855, p. 48, Paneth et al. 1998 (1855)

    on the whole evidence, it seems impossible to doubt that the influences, which determine in mass the geographical distribution of cholera in London, belong less to the water than to the air.

  • Eyler J.M. 2001, abstract (2001) Verified 20 Sep 2026

    In the 1840s and 1850s Farr's work was considered definitive, while Snow's was regarded as ingenious but flawed.

  • Hempel S. (2024) Verified 20 Sep 2026

    Snow was derided and dismissed

  "Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.

• Koch isolates the cholera pathogen; germ theory displaces miasma

  refuted by · Confidence: high

  By the end of the 19th century the germ theory of Pasteur and Koch displaced the miasma theory as the main explanation of infectious disease.

  Dispute: The replacement was not instantaneous: Halliday titled his article on miasmatism "an obstinate belief". Pettenkofer, Germany's senior hygienist, held that cholera epidemics were governed by more than a microbial agent and argued with Koch into the 1890s, in 1892 drinking a fresh culture of the vibrio to prove his point; according to Dolman, after the Hamburg epidemic of 1892 and Koch's 1893 papers on the waterborne origin of the outbreaks "his views won widespread support, while Pettenkofer's adherents dwindled".

  Link sources

  • Kiechle M.A. Nursing Clio 2025 (2025) Verified 20 Sep 2026

    By the end of the nineteenth century, germ theory was replacing miasma theory as the most prominent explanation for the cause and spread of disease.

  • Britannica, History of medicine (2024) Verified 20 Sep 2026

    Koch discovered the organisms of tuberculosis in 1882 and of cholera in 1883.

  • Dolman C. E. «Koch, Heinrich Hermann Robert», Complete Dictionary of Scientific Biography (via Encyclopedia.com) Verified 20 Sep 2026

    Max von Pettenkofer, Germany's senior hygienist, who believed other factors besides a microbial agent governed cholera epidemics, was invited only to the five-day second conference.

  • Dolman C. E. Verified 20 Sep 2026

    In three subsequent papers (1893) Koch reported on the bacteriological diagnosis of cholera, the control of sand filtration of water, and the waterborne origins of the Hamburg and related Prussian epidemics. His views won widespread support, while Pettenkofer's adherents dwindled.

  "Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.

• Disinfection of hands with chlorinated lime in a maternity ward

  refuted by · Confidence: high

  Semmelweis explained childbed fever not by corrupted air but by particles of decaying organic matter carried on the hands from the dissecting room, so that to accept his conclusion meant giving up the miasmatic explanation and the doctrine of an epidemic constitution; Viennese and German physicians preferred to keep the older explanations.

  Dispute: Historians dispute not the clash with the miasmatic explanation itself but the reasons why contemporaries did not give way. Schreiner (2020) names both versions at once: on one side attachment to the older theories and Semmelweis's place in the Viennese hierarchy, on the other his own manner of arguing, to the point of calling colleagues murderers. Tulodziecki (2013) goes further and holds that the resistance had rational grounds and that Semmelweis's own reasoning was weaker than is usually assumed.

  Link sources

  • Stang A., Standl F., Poole C. «A twenty-first century perspective on concepts of modern epidemiology in Ignaz Philipp Semmelweis' work on puerperal sepsis», European Journal of Epidemiology (2022) Verified 20 Sep 2026

    Acceptance of Semmelweis' discovery therefore meant that the two prevailing theories of the etiology of PS, miasmatic theory (“a bad component in the air”) and atmospheric-cosmic-telluric conditions (Galenic hypothesis), had to be denied

  • Schreiner S. «Ignaz Semmelweis: a victim of harassment?», Wiener Medizinische Wochenschrift 170, 293-302 (2020), 302 Verified 20 Sep 2026

    they preferred the old-fashioned genius epidemicus, atmospheric influence, climate theories, and the miasma

  • Tulodziecki D. «Shattering the Myth of Semmelweis», Philosophy of Science 80(5), 1065-1075 (2013) Verified 20 Sep 2026

    This widespread agreement has also given rise to a puzzle: why Semmelweis's views were rejected for so long. I aim to dissolve both this puzzle and the standard view of Semmelweis by showing that, contrary to prevailing opinion, Semmelweis was not the excellent reasoner he has been assumed to be.

  "Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.

  Further reading

  Not evidence: these carry no quotation and support nothing we wrote. They are books and scans to read next.

  • Carter K.C., Carter B.R. «Childbed Fever: A Scientific Biography of Ignaz Semmelweis», Transaction Publishers (2005)

Node sources

• Hippocrates. On Airs, Waters, and Places, MIT Classics (-400) Verified 20 Sep 2026

  Whoever wishes to investigate medicine properly, should proceed thus: in the first place to consider the seasons of the year, and what effects each of them produces for they are not at all alike, but differ much from themselves in regard to their changes. Then the winds, the hot and the cold, especially such as are common to all countries, and then such as are peculiar to each locality. We must also consider the qualities of the waters, for as they differ from one another in taste and weight, so also do they differ much in their qualities.

• Hippocrates. On Airs, Waters, and Places, MIT Classics (-400) Verified 20 Sep 2026

  Such waters then as are marshy, stagnant, and belong to lakes, are necessarily hot in summer, thick, and have a strong smell, since they have no current; but being constantly supplied by rain-water, and the sun heating them, they necessarily want their proper color, are unwholesome and form bile

"Verified" means that on that day the quotation was found at the address given, word for word. No date means we have not been able to open the source yet, not that the quotation is wrong.

Further reading

Not evidence: these carry no quotation and support nothing we wrote. They are books and scans to read next.

• Kiechle M.A. Miasma Theory: A Primer. Nursing Clio (2025)
• Karamanou M. et al. From miasmas to germs: a historical approach to theories of infectious disease transmission. Le Infezioni in Medicina 20(1): 58-62 (2012)

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