Instincts of the Herd in Peace and War

Instincts of the Herd in Peace and War is the title of an influential book by English surgeon Wilfred Trotter, published in 1916. Based on the ideas of Gustave Le Bon, it was very influential in the development of group dynamics and crowd psychology, and the propaganda of Edward Bernays. It was also cited by Q. D. Leavis in her book Fiction And The Reading Public.

From Instincts of the Herd in Peace and War (1942 ed., pg. 90):