Sydney Ringer’s name survives in laboratories and hospitals through a solution first devised for a more immediate scientific problem: how to keep a frog’s heart beating outside the body. His experiments showed that calcium, alongside other ions, was necessary for cardiac contraction. The work helped establish the physiological importance of calcium and gave rise to Ringer’s solution, with later versions adapted for different species and experimental conditions.
A Norwich childhood and a London medical training
Ringer was born in Norwich in March 1835 into a nonconformist family. His father died in 1843, when Sydney was still young, and the family experienced poverty. He attended a Baptist school in Norwich, where his teachers included the writer and clergyman Ebenezer Cobham Brewer. Before going to medical school, Ringer spent a year working at the Norfolk and Norwich Hospital under surgeon B. H. Norgate.
In 1854 he began studying medicine at University College London, then a route into the profession for a nonconformist who could not take the usual path through Oxford or Cambridge. He graduated in 1860 and trained at University College Hospital, where he began his professional career. The university and hospital remained central to his work for decades, bringing clinical practice, teaching and physiological research into close contact.
Ringer became a full physician at University College Hospital by 1866. From 1865 to 1869 he was also assistant physician at the Great Ormond Street Hospital for Children. His career combined hospital medicine with academic appointments: he was professor of materia medica from 1862 to 1878, professor of the principles and practice of medicine from 1878 to 1887, and Holme Professor of Clinical Medicine from 1887 until 1900.
What a beating frog’s heart revealed
Ringer’s best-known research took place in the developing physiology department at University College. He investigated the conditions needed to sustain a spontaneously beating frog’s heart outside the body. By testing simple chloride salts, he established a minimal ionic composition for physiological saline: sodium, potassium and calcium. Crucially, he demonstrated that extracellular calcium was necessary for the heart muscle to continue contracting.
This was more than a practical recipe for keeping tissue alive during an experiment. The finding revealed a physiological role for calcium, which subsequent research established in many cellular processes. Ringer’s solution became the basis for a family of formulations rather than a single unchanging mixture: researchers adapted its composition to suit different species and experimental conditions. Clinically important derivatives include Ringer’s lactate, also known as Hartmann’s solution.
The original account of Ringer’s work presents the solution chiefly as a foundation for intravenous treatment. Its clearest documented significance, however, lies in the experiment that produced it and the physiological principle the experiment demonstrated. The work gave researchers a controlled medium for studying living tissue and cardiac function. Its later derivatives extended that legacy into clinical use, but they should not be confused with the specific finding that made Ringer’s name enduring: the need for calcium outside the cell to sustain contraction.
Physician, teacher and author
Ringer’s influence was not confined to the laboratory. His clinical appointments at University College Hospital and Great Ormond Street connected his research career with patient care and medical education. He wrote Handbook of Therapeutics, first published in 1869, which eventually went through 14 editions. The book’s long publication history reflects the breadth of his work as a physician as well as his standing as a teacher and researcher.
His professional recognition grew alongside that career. He became a Fellow of the Royal College of Physicians in 1870 and was elected a Fellow of the Royal Society in 1885. These honours marked his position within British medicine and science; his more lasting recognition is carried in the name given to the solution developed from his experiments.
Ringer also made a separate contribution to clinical observation. In 1879, while examining a Taiwanese patient, he was the first to identify the parasitic infection caused by Paragonimus westermani in a human. The species is also known by the alternative name Paragonimus ringeri. This work illustrates a different aspect of his medical practice: careful examination could identify a disease in a patient as well as establish a principle through controlled experimentation.
From University College to a lasting name
Ringer remained at University College throughout his academic career, moving through successive professorships before retiring from the Holme chair in 1900. He died after a stroke on 14 October 1910 at Lastingham in Yorkshire. His career had joined the clinical duties of a hospital physician to the work of a university teacher and experimental physiologist.
Ringer’s birth year has sometimes been given as 1836 in census records and other documents, while his gravestone and other records give 1835. His baptismal record, referred to in his will, supports 1835. A blue plaque to Ringer was unveiled at University College London in March 2022, marking the connection between the scientist and the institution where he trained, taught and conducted his best-known research.
Why Sydney Ringer deserves a place in British Legacy
Ringer’s place in British Legacy rests on a specific scientific achievement, not on a general claim of national greatness. At University College, he showed that extracellular calcium was necessary to sustain contraction in the spontaneously beating frog’s heart. In doing so, he established the minimal ionic composition of a physiological saline and helped reveal the wider importance of calcium in cellular processes. The solution named for him made that research practically useful: later versions could be adjusted for different species and experimental conditions, and clinically important derivatives include Ringer’s lactate. His work therefore connected a carefully controlled experiment with a body of knowledge used far beyond the original laboratory question.
His wider career also gives the legacy substance. Ringer trained and worked in London, served as a physician at University College Hospital and Great Ormond Street Hospital, held successive professorships, and wrote a therapeutics handbook that reached 14 editions. His research on a parasitic infection in a Taiwanese patient shows that his contribution was not confined to cardiac physiology. The blue plaque at University College London makes visible the British institutional setting in which much of this work took place. Remembering Ringer means recognising how clinical practice, teaching and experimental science could reinforce one another—and how a result established in a university laboratory could become an enduring tool and scientific reference.
Sources
Sydney Ringer — Wikipedia revision 1375004134 · Sydney Ringer — Wikipedia
Adapted in part from Sydney Ringer by Wikipedia contributors, under CC BY-SA 4.0. Text has been edited and combined with the existing article; this adapted text is shared under the same licence. Contributor history.