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Updated: April 30, 2025
At an earlier date Haeckel had made an attempt in this direction in his theory of the “perigenesis of the plastidules.” Peculiar states of oscillation and rhythm in the molecules of the germ-substance, handed on to it from the parent organism and transferable to all the assimilated matter of the offspring, represent, according to this theory, the principle which impels development to follow a particular course corresponding to the type of the parents.
This enables him to explain heredity by his theory of the "Continuity of the Germ-plasm." Parent and offspring are alike successive products or offshoots of this persistent germ-substance, which obviously would not be correspondingly affected by modifications of parts in parents, and so would render the transmission of acquired characters impossible. Mr.
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