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A pioneering British physiologist, he helped transform how scientists understand digestion and chemical signaling in the body. His work with Ernest Starling led to the discovery of secretin, one of the first substances recognized as a hormone.

by John Frederick Adolphus McNair, W. D. Bayliss
Born in 1860, William Maddock Bayliss was an English physiologist whose research had a major impact on modern physiology. He is especially remembered for collaborative work with Ernest Starling that showed how the body uses chemical messengers as well as nerves to regulate important functions.
Bayliss and Starling are best known for identifying secretin, a discovery that helped establish the concept of hormones. Bayliss also wrote Principles of General Physiology (1915), a widely respected scientific text of its time.
He was knighted in 1922, and his work remains an important part of the history of medicine and biology. For listeners interested in early scientific writing, he stands out as a clear example of a researcher who helped reshape the foundations of his field.