Walter Bradford Cannon (1871-1945), US physiologist. Cannon graduated from Harvard University in 1900. While still a student at Harvard, he had fed a

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Walter Bradford Cannon (1871-1945), US physiologist. Cannon graduated from Harvard University in 1900. While still a student at Harvard, he had fed a cat a bismuth compound in a meal to make its digestive tract visible on an X-ray. This was the first use of a radio-opaque medium. Later Cannon worked on the effect of shock and emotions on the nervous system. He studied Bernard's idea of the necessity of a constant internal physiological environment and coined the term homeostasis to describe the processes by which this environment is maintained. This photograph, published in Boston, USA, dates from around 1908.

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Photo credit: © NATIONAL LIBRARY OF MEDICINE/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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