The Expression of the Emotions in Man and Animals in the field of comparative psychology and his impact on academic psychology was muted, partly because of the widespread influence of the behaviourist school during the twentieth century. The lavish style of biological illustration was followed in work on animal locomotion by photographer Eadweard Muybridge (1830–1904)(leading to cinematography), and by the Scottish naturalist James Bell Pettigrew (1832–1908); in the extensively (and controversially) illustrated works of the evolutionary biologist Ernst Haeckel; and – to a lesser extent – in D'Arcy Thompson's "On Growth and Form" (1917). Darwin's ideas were followed up in William James' "What Is An Emotion ?" (1884); and,
History of emotions historiographical approaches such as conceptual history, historical constructivism and the history of the body. Similar to the sociology of emotions or anthropology of emotions, the history of emotions is based on the assumption that not only the expression of feelings, but also the feelings themselves are learned. Culture and history are changing and so are feelings as well as their expression. The social relevance and potency of emotions is historically and culturally variable. In the view of many historians, emotion is, therefore, just as fundamental a category of history, as class, race or gender. A number of different methodological approaches