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- Let us pass to the secondary evolution considered in itself. It
- involves two great features, -- differentiation and the increase of
- definiteness through segregation. The differentiation is a cumulative
- process, due to the fact that a plastic body keeps the traces of what
- has happened to it, and so constantly prepares a basis for new
- varieties of effects to be produced upon its various parts.
- The segregation is due to the sorting types of forces, such as
- were exemplified in our summary.
-