This book conducts an experiment: Like in a laboratory, two of the most aggressive "acids" of modern theory formation are poured into a bowl to observe how the mixture behaves. Charles Darwin and Michel Foucault both represent a way of thinking that radically breaks with traditions and questions the distinction between nature and culture as well as the supposed essence of things. Philipp Sarasin brings these two outstanding theorists into an exciting dialogue. Through his meticulous reading, it becomes evident that Foucault's thinking is derived from Darwin in many respects.