The International Encyclopedia of Unified Science (IEUS) was a series of publications devoted to unified science. The IEUS was conceived at the Mundaneum Institute in The Hague in the 1930s, and published in the USA beginning in 1938. It was an ambitious project that was never completed.
The IEUS was an output of the Vienna Circle to address the "growing concern throughout the world for the logic, the history, and the sociology of science..." Only the first section Foundations of the Unity of Science (FUS) was published; it contains two volumes for a total of nineteen monographs published from 1938 to 1969.
Creation of the IEUS was facilitated by the International Congresses for the Unity of Science organized by members of the Vienna Circle. After a preliminary conference in Prague in 1934, the First International Congress for the Unity of Science was held at the Sorbonne, Paris, 16–21 September 1935.:171 It was attended by about 170 people from over twenty different countries. With the active involvement of Kazimierz Ajdukiewicz (Poland), Susan Stebbing (England), and Federigo Enriques (Italy) the scope of the project for an IEUS was considerably expanded.:173 The congress expressed its approval of the planned IEUS as proposed by the Mundaneum, and further set up a committee to plan future congresses.:173 This committee included the following members::173
The Third International Congress for the Unity of Science, which was devoted exclusively to the IEUS, was held in Paris, 29–31 July 1937.:182
Foundations of the Theory of Signs (FUS I-2)
Foundations of Logic and Mathematics (FUS I-3)
Linguistic Aspects of Science (FUS I-4)
Procedures of Empirical Science (FUS I-5)
Victor F. Lenzen
Principles of the Theory of Probability (FUS I-6)
Foundations of Physics (FUS I-7)
Cosmology (FUS I-8)
Foundations of Biology (FUS I-9)
The Conceptual Framework of Psychology (FUS I-10)
Foundations of the Social Sciences (FUS II-1)
Science and the Structure of Ethics (FUS II-3)
Theory of Valuation (FUS II-4)
The Technique of Theory Construction (FUS II-5)
Joseph H. Woodger
Methodology of Mathematical Economics and Econometrics (FUS II-6)
Concept Formation in Empirical Science (FUS II-7)
Carl G. Hempel
The Development of Logical Empiricism (FUS II-9)
Historian David Hollinger argued that the IEUS was a less comprehensive account of the sciences of the time than it could have been, and was especially weak in the social sciences. Hollinger noted that the Encyclopaedia of the Social Sciences, published around the same time, provided a much more comprehensive account of the social sciences: "The Encyclopedia of the Social Sciences (12 vols., New York, 1933–1937) was a prodigious endeavor brought to successful completion by Alvin Johnson. This encyclopedia is a much more important episode in the history of thought than The International Encyclopedia of Unified Science yet has attracted much less attention from historians than the abortive enterprise led by Neurath." Hollinger also said that the scholarly journal Philosophy of Science, founded in 1934, provided a much more inclusive perspective on the sciences in those years than did the IEUS.
American political theorist James Burnham refers to the Encyclopedia in Science and Style: A Reply to Comrade Trotsky (1940), his penultimate tract discussing his differences with Trotsky and marking Burnham's renouncement of dialectical materialism. In this text he responds to Trotsky's request to draw his attention to "those works which should supplant the system of dialectic materialism for the proletariat" by referring to Principia Mathematica by Russell and Whitehead and "the scientists, mathematicians and logicians now cooperating in the new Encyclopedia of Unified Science".
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