Experiments and observations on the gastric juice

This book, published in 1833, details William Beaumont's experiments on Alexis St. Martin, a patient with a permanent gastric fistula resulting from a gunshot wound.

Beaumont's work conclusively established the chemical nature of digestion, identified the presence and role of hydrochloric acid in the stomach, and described the temperature and movement of the stomach walls during digestion.

His findings revolutionized the understanding of digestive physiology and had a significant impact on medical research, particularly in Europe.