Organicism is the philosophical perspective which views the universe and its parts as organic wholes and - either by analogy or literally - as living organisms. It can be synonymous with holism. Organicism is an important tradition within the history of natural philosophy where it has remained as a vital current alongside reductionism and mechanism, the approaches that have dominated science since the seventeenth century. Plato is among the earliest philosophers to have regarded the universe as an intelligent living being (see Timaeus). Organicism flourished for a period during the era of German romanticism during which time the new science of biology was first defined by Jean-Baptiste Lamarck. Within modern-day biological sciences organicism is the approach that stresses the organization (particularly the self-organizing properties), rather than the composition, of organisms. William Emerson Ritter first used the term in this sense in 1919 after which it became well-accepted during the course of the 20th century.
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Organicism as a doctrine rejects mechanism and reductionism (doctrines that claim that the smallest parts by themselves explain the behavior of larger organized systems of which they are a part). However, organicism also rejects vitalism, the doctrine that there is a vital force different from physical forces that accounts for living things.
A number of biologists in the early to mid-twentieth century embraced organicism. They wished to reject earlier vitalisms but to stress that whole organism biology was not fully explainable by atomic mechanism. The larger organization of an organic system has features that must be taken into account to explain its behavior.
Gilbert and Sarkar distinguish organicism from holism to avoid what they see as the vitalistic or spiritualistic connotations of holism. Dusek notes that holism contains a continuum of degrees of the top-down control of organization, ranging from monism (the doctrine that the only complete object is the whole universe, or that there is only one entity, the universe) to organicism, which allows relatively more independence of the parts from the whole, despite the whole being more than the sum of the parts, and/or the whole exerting some control on the behavior of the parts.
Still more independence is present in relational holism. This doctrine does not assert top-down control of the whole over its parts, but does claim that the relations of the parts are essential to explanation of behavior of the system. Aristotle and early modern philosophers and scientists tended to describe reality as made of substances and their qualities, and to neglect relations. Gottfried Wilhelm Leibniz showed the bizarre conclusions to which a doctrine of the non-existence of relations led. Twentieth century philosophy has been characterized by the introduction of and emphasis on the importance of relations, whether in symbolic logic, in phenomenology, or in metaphysics.
William Wimsatt has suggested that the number of terms in the relations considered distinguishes reductionism from holism. Reductionistic explanations claim that two or at most three term relations are sufficient to account for the system's behavior. At the other extreme the system could be considered as a single ten to the twenty-sixth term relation, for instance.
Organicism has some intellectually and politically controversial or suspect associations. "Holism," the doctrine that the whole is more than the sum of its parts, often used synonymously with organicism, or as a broader category under which organicism falls, has been co-opted in recent decades by "holistic medicine" and by New Age Thought. German Nazism appealed to organicist and holistic doctrines, discrediting for many in retrospect, the original organicist doctrines. (See Anne Harrington). Soviet Dialectical Materialism also made appeals to an holistic and organicist approach stemming from Hegel via Karl Marx's co-worker Friedrich Engels, again giving a controversial political association to organicism.
Organicism' has also been used to characterize notions put forth by various late 19th-century social scientists who considered human society to be analogous to an organism, and individual humans to be analogous to the cells of an organism. This sort of organicist sociology was articulated by Alfred Espinas, Paul von Lilienfeld, Jacques Novicow, Albert Schäffle, Herbert Spencer, and René Worms, among others (Barberis 2003: 54).
In biology organicism considers that the observable structures of life, its overall form and the properties and characteristics of its component parts are a result of the reciprocal play of all the components on each other.  Examples of 20th century biologists who were organicists are Ross Harrison, Paul Weiss, and Joseph Needham. Donna Haraway discusses them in her first book Crystals, Fabrics, and Fields. John Scott Haldane (father of J. B. S. Haldane), R. S. Lillie, W. E. Agar, and Ludwig von Bertalanffy are other early twentieth century organicists. Robert Rosen, founder of "Relational Biology" provided a comprehensive mathematical and category-theoretic treatment of irreducible causal relations he believed to be responsible for life. 
Theoretical Biology Club
In the early 1930s Joseph Needham, Joseph Henry Woodger, C. H. Waddington and Dorothy Wrinch formed the Theoretical Biology Club in order to promote the organicist approach to biology. The club was in opposition to mechanism, reductionism and the gene-centric view of evolution. Most of the members were influenced by the philosophy of Alfred North Whitehead. The club disbanded as funding was failed from the Rockfeller Foundation which was needed for them to carry out their investigations.
- "The theory that everything in nature has an organic basis or is part of an organic whole" OED
- For example, the philosophers of the Ionian Enlightenment were referred to by later philosophers (such as Aristotle) as hylozoists meaning 'those who thought that matter was alive' (see Farrington (1941/53)
- For a general overview see Capra (1996)
- In particular the writings of Friedrich Schelling and Goethe
- http://www.jstor.org/pss/3745903 Organicism in Biology, Joseph Needham, Journal of Philosophical Studies 1928 . Accessed Jan 2011
- Rosen, R. 1991. "Life Itself: A Comprehensive Inquiry Into the Nature, Origin, and Fabrication of Life". Columbia University Press, New York
- Reconciling science and religion: the debate in early-twentieth-century Britain, 2001, Peter J. Bowler
- A history of molecular biology, Michel Morange, Matthew Cobb, 2000, p. 91
- Cambridge scientific minds, Peter Michael Harman, Simon Mitton, 2002, p. 302
- Greater than the parts: holism in biomedicine, 1920-1950, Christopher Lawrence, George Weisz, Oxford University Press, 1998, p. 12
- The future of DNA, Johannes Wirz, Edith T. Lammerts van Bueren, 1997, p. 87
- Barberis D. S. (2003). In search of an object: Organicist sociology and the reality of society in fin-de-siècle France. History of the Human Sciences, vol 16, no. 3, pp. 51–72.
- Beckner, Morton, (1967) Organismic Biology, in "Encyclopedia of Philosophy," ed. Paul Edwards, MacMillan Publishing CO., Inc. & The Free Press.
- Dusek, Val, (1999). The Holistic Inspirations of Physics, Rutgers University Press.
- Haraway, Donna (1976). Crystals, Fabrics, and Fields, Johns Hopkins University Press.
- Harrington, Anne (1996). Reenchanted Science, Harvard University Press.
- Mayr, E. (1997). The organicists. In What is the meaning of life. In This is biology. Belknap Press of Harvard University Press.
- Gilbert, Scott F. and Sahotra Sarkar (2000): “Embracing complexity: Organicism for the 21st Century”, Developmental Dynamics 219(1): 1–9. (abstract of the paper: )
- Wimsatt, Willam (2007) Re-engineering Philosophy for Limited Beings :Peicewise Approximations to Reality, Harvard University Press.