Originally published in 1929, this book presents a comprehensive biography of the clergyman, scientific pioneer and philanthropist Stephen Hales (1677–1761). Aimed at the general reader, together with botanists and physiologists, the text was produced upon instruction from the Masters and Fellows of Corpus Christi College, Cambridge to mark the 250th anniversary of the birth of Hales. Illustrative figures and notes are incorporated throughout. This is a highly readable book that will be of value to anyone with an interest in the life and works of Hales or the history of science.