The Expression of the Emotions in Man and Animals is discussed in detail by Lucille Ritvo.John Bowlby makes extensive reference to Darwin's ideas in his presentations of attachment theory. Constitutional (psychosomatic) theories of personality were elaborated by Paul Schilder (1886 - 1940) with his notion of the body image, by the psychiatrist Ernst Kretschmer and in the (now largely discredited) somato-typology of W H Sheldon (1898 - 1977). The biology of the human emotions was further explored by Desmond Morris in his (richly illustrated) popular scientific book "Manwatching".In 2003, the New York Academy of Sciences published "Emotions Inside Out: 130 Years after Darwin's The Expression of the Emotions in
The Expression of the Emotions in Man and Animals with engravings of the Darwin family's domestic pets by the zoological illustrator T. W. Wood as well as work by the artists Briton Rivière, Joseph Wolf and A.D. May. It also included portraits by the Swedish photographer Oscar Rejlander (1813–1875), anatomical diagrams by Sir Charles Bell (1774–1842) and Friedrich Henle (1809–1885), as well as illustrational quotations from the "Mécanisme de la physionomie humaine" (1862) by the French neurologist Duchenne de Boulogne (1806–1875). As a result of his domestic psychology experiments, Darwin reduced the number of commonly observed emotions from Duchenne's calculation of more than sixty facial expressions, to just six