Preservation Notes

Mapping Cholera in 1849: John Lea and Henry Boyd in Cincinnati

This is a story about John Lea, a Cincinnati notary and amateur geologist, who was obsessed with finding the cause of Choler, and about Henry Boyd, a highly successful Cincinnati furniture maker and former enslaved Kentuckian.  In 1832 Henry Boyd, determined that water was the source of cholera transmission. Boyd’s recommendation to boil all drinking water was published in Cincinnati newspapers, and had it been widely implemented, would have saved thousands of lives in the waves of cholera outbreaks in the 19th century. CPA Executive Director Paul Muller takes a look at this fascinating piece of local history in the 15 minute video below.

John Lea believed cholera had geologic origins, and in the course extensive research Lea produced an 1849 map of the cases of the disease along a section of Sycamore Street.  Lea created a map of victims of the 1849 cholera epidemic in Cincinnati. This early mapping of a disease outbreak was years before London physician John Snow created his famous Broad Street Pump Map.  Lea’s work set the stage for decades of public health research and is acknowledged as important advance in use of the scientific method in the study of disease. 

Lea and Boyd are increasingly cited for their pioneering concepts about the source of cholera and their recommendations on how to stop its spread. Tom Koch in his “Commentary: The Researcher as Amateur: John Lea, Cholera, and … the Computer Age” placed Lea in the timeline of the history of scientific research:

“The importance of Lea’s published work … lies in the quite extraordinarily complete and efficient methodology he employed, including the detailed study of a Cincinnati neighborhood outbreak of an infectious disease. His approach demonstrates a research model still used by local and professional researchers (in cancer, cholera, typhoid, etc.) into the twentieth century.”  

David Morens, an epidemiologist at National Institute of Allergy and Infectious Diseases at the National Institutes of Health acknowledges both Lea and Boyd in his “Commentary: Cholera conundrums and proto-epidemiologic puzzles. The confusing epidemic world of John Lea and John Snow” .  Morens noted that  “Lea was among the first to correctly establish an unambiguous association between water source and cholera occurrence by organized observational study, and among the first to propose a valid means of preventing it.”

“…While it is not clear whether Lea’s conviction that drinking pure water completely prevented cholera was his alone, or whether the original observation should be credited to Henry Boyd  or unknown others, it was clearly Lea who tirelessly promoted the implications for public health. … It is not known whether Boyd ever advanced his cholera theory after 1832, or whether he and Lea ever discussed it or even knew each other.”  

Today John Lea and Henry Boyd are both buried in Spring Grove Cemetery, Lea has a significant monument, Boyd’s is in an unmarked grave.

Henry Boyd’s place in Cincinnati history is not at the level of prominence his work deserves.  We should be telling the deeper history of Cincinnati and honoring people like Henry Boyd who contributed in so many areas of public life.  We can fix a small piece of the problem by placing a historic marker at the site of Boyd’s furniture works on the northwest corner of 8th and Broadway.  If you want to be part of the effort, just let us know.

Further Reading and Source Information:

Cholera, with reference to the geological theory: A proximate cause – a law by which it is governed – a prophylactic1  by John Lea, 1850, reprint in International Journal of Epidemiology, Volume 42, Issue 1, February 2013, Pages 30–42

Henry Boyd, 1802-1886, The Black Agenda and The Cincinnati Herald Historical Site, Cincinnati African-American Historical Archives

Commentary: The Researcher as Amateur: John Lea, Cholera, and … the Computer Age  Tom Koch, International Journal of Epidemiology, Volume 42, Issue 1, February 2013, Pages 52–58, Published: 14 March 2013

Commentary: Cholera conundrums and proto-epidemiologic puzzles. The confusing epidemic world of John Lea and John Snow David M Morens, International Journal of Epidemiology, Volume 42, Issue 1, February 2013, Pages 43–52, Published: 14 March 2013

Cincinnatians and Cholera: Attitudes Toward the Epidemics of 1832 and 1849   Queen City Heritage, Fall 1992, by Ruth C. Carter

Cincinnati Panorama of 1848, The Public Library of Cincinnati and Hamilton County

The Specter of Cholera in Nineteenth-Century Cincinnati, Matthew D. Smith, Ohio Valley History, Volume 16, Number 2, Summer 2016, pp. 21-40 (Article) Published by The Filson Historical Society and Cincinnati Museum Center

Youtube Video on John Snow and the Broad Street Pump, HarvardX

A bed frame in the style of Henry Boyd’s famous Boyd Bedstead
John Lea’s Map of the 1849 Cholera Epidemic showing a section of Sycamore Street just north of Liberty Street. It is considered an important step in the application of the scientific method to the study of disease outbreaks.

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A look inside Pinecroft, the Estate of Powel Crosley, Jr.

This 18 acre National Historic Register site is owned by Cincinnati Preservation Association and managed by Funky’s Catering.  Click on the image above to see a short video about this 1928 Tudor Revival historic site.  To explore the VR model shown in the video click here.

Parking Lot Construction at the John Hauck House

The John Hauck House on Dayton Street
Parking Lot nearing completion
Walkway to new parking lot will go thru the garden.
View of Hauck House parking lot from Bank Street
Ongoing restoration work inside the John Hauck House.

Age of Buildings Map of Cincinnanti by Nathan Rooy

Following his wide ranging interests, Nathan Rooy asks a lot of questions.  He generously shares  what he finds.  A few years Nathan created a map showing the Age of Buildings in Cincinnati.  It is worth taking a deep look at.  You will learn some interesting about your own neighborhood and the entire city. Nathan’s other explorations are at his site here or by clicking on the map above.


A Street Scene from a Busier Time in Cincinnati

Have you noticed how seeing people in large groups already looks strange?  I know we will get back to gathering when it’s safe but am surprised at how quickly what seems normal can change.  Here is a Cincinnati street crossing clip with lots of people too close together by today’s standard. Bonus question: guess the year.

Thanks to Mike Martini and Media Heritage Collection at the VOA museum for use of this clip.