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by NI. J. SIRKS (Genetisch Instituut, Haren, Groningen) (rec. 19 . X. 195x) Concepts in natural science, in order to be justified, must meet three requirements: they must be defined as closely as possible, so that we shall not mistake one another and in discussions everyone shall understand precisely what the others mean by them. Yet they must be elastic, flexible, so as to admit of modifications as fresh insight and newly acquired know- ledge may necessitate. These two requirements are no contradictions; they wiU never lead to difficulties, if only we make it clear what definition of a concept we employ. The third requirement asks that the concept shall be manageable, that it can be applied by those who are to work with it.' This requirement can fairly easily be brought to agree with the first, as a close definition offers a fast hold and a firm basis; it is, however, not so easily met when we wish to keep the concept plastic and flexible, because when the element of plasticity and flexibility comes in, its manageability is much impeded. Yet this plasticity of concept is an essential requirement: in former centuries every concept had another content than
Acta Biotheoretica – Springer Journals
Published: May 25, 2005
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