PAUL D STEWART / SCIENCE PHOTO LIBRARY PAUL D STEWART / SCIENCE PHOTO LIBRARY
Darwin on human emotions. Heliotype illustration of smiling expressions from 'The Expression of the Emotions in Man and Animals' (1872) by British naturalist Charles Darwin (1809-1882). This was one of the first books to be illustrated with photographs, with seven heliotype plates, a photo-mechanical process that could reproduce photographs directly onto the page. Darwin wanted to show the animal origins of human expression and emotion to show that decent was likely. He saw photography as a tool for accurately capturing brief expression. Here he illustrates the facial muscles used when smiling and laughing. He used (with permission) the photographs of others. Photographs 1 and 3 were taken by Rejlander, 2 by Wallich, and the remainder come from Duchenne.
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