Sherrington had long studied the 16th century French physician Jean Fernel, and grew so familiar with him that he considered him a friend. In the years of 1937 and 1938, Sherrington delivered the Gifford lectures at the University of Edinburgh; these focused on Fernel and his times, and came to form the principal content of Man on His Nature. The book was released in 1940, and a revised edition came out in 1951. It explores philosophical thoughts about the mind, the human existence, and God, in connection with natural theology. In his ideas on the mind and cognition, Sherrington introduced the idea that neurons work as groups in a "million-fold democracy" to produce outcomes rather than with central control.
