ONTOGENY AND THE HIERARCHY OF TYPES

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Abstract
- The long history of belief in a parallelism between ontogeny and a hierarchical order of natural things is reviewed. The meaning of von Baerian recapitulation is analyzed and its implications for cladistic methodology are discussed at two levels: ontogeny and homology. The basic problem inherent in the purported parallelism is that the order of natural things (i.e., the taxic approach to homology) is part of the "world of being" of Platonic ideas, whereas ontogeny and phylogeny (i.e., the transformational approach to homology) belong to Plato's "world of becoming." These two "genera of existence," as Plato put it, being and becoming, are incompatible but complementary views of nature.

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