Abstract
There are a great variety of methods in Numerical Taxonomy, and as indicated by P.H.A. Sneath at this Conference (Philosophy and Method in Biological Classification), there is not only one, but many ways to classify, according to the purposes of the classification. But any classification is based on data which can vary, in Biology, depending on external or internal factors. If the variation due to external agents is easy to detect, the variation caused by internal factors, such as physiological correlations, is often more insidious: the effects of such correlations are to superimpose on the interindividual variation which is evident, an intraindividual variation which can severely bias measures or descriptions. And without the most precise knowledge of this source of variability, Numerical or Classical Taxonomy is nonsense.
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