Hennig's heuristic principles (Was: Positivism in evolutionary scienc)

[Thomas Schlemmermeyer]

Hello,
>=20
> support that choice of approach. Practically speaking, does this mean tha=
t
> Hennig was suggesting use of his methods to provide a starting point for
> what, hypothesis formulation?

Yes, if I understood Hennig correctly. The human observer is able to
observe ontogenetic relations (development) and tokogenetic relations=20
(reproduction).
This suggests that there are phylogenetic relations (macroevolution) as
well.
But phylogenetic relations are formulated as hypotheses. They cannot be
directly observed.

Thomas

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Thomas Schlemmermeyer
Museu de Zoologia, Universidade de S=E3o Paulo
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