摘要：Classification is the essence of the sciences of biology and chemistry. With-out the genus and species concepts of the former, and the periodical table of ele-ments of the latter, these disciplines would be very different enterprises. While it is of course a wild exaggeration to say that biological and chemical science consists of no more than cata-loging, even contemplating this notion is a dramatic way of underscoring the cru-cial centrality of this mode of analysis to those bodies of learning.
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