(Cf. the phenomenon
of the «runners» at first connected with the mother plant and then separated from it; the fluid transition between various plants and animals which appear to be one; the germ - cell inside and outside the parent organism, etc.)
Living forms which present what are apparently very great differences in space and time can ontologically have the same
morphological principle, so that enormous differences
of external form can derive from the material substratum and chance patterns
of circumstance without
change of substantial form (caterpillar - chrysalis butterfly).
His point is that
morphological changes in
living things, if we view them intuitively, do seem to proceed from, or in, the periphery — think
of the blastula or neurula in embryology, or
of the unfolding
of leaves in botany.