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Updated: June 19, 2025
Moreover, the hypothesis, in claiming that a heterogenetic generation of one species from another must necessarily nullify all similarity between the organism of the child and that of the mother, is so little convincing, and shows in the necessity of conceiving the universal type of organisms, the type of kingdoms, of main types, of classes, of orders, of families, of genera, and of species, as but individual existences which, in the form of cells and before the existence of the developed species, partly through many thousands of years, lead a real empiric and concrete life such an abstract synthetical construction of nature, that we are not astonished that the theory of the genealogy of primordial cells stands almost alone.
But where, as in the present section, we treat the descent theory apart from the evolution theory, we have also to think of the possibility that the species or groups of species are not originated through gradual development, but nevertheless do originate through descent namely, in leaps through metamorphosis of germs or a heterogenetic generation; and for such an idea we find confirmation in the observation of the history of development of animals, which we call change of generation or metagenesis.
This shows that its author believed in the possibility of the "superior organic forms," like the mastodon, megatherium, etc. from the "heterogenetic elements" those undergoing every conceivable change as well as the "inferior forms." At all events, it is a legitimate induction from materialistic premises.
For while in regard to the latter we had to say that we have either this explanation or none of the origin of the higher species, with the evolution theory there is not even room for this alternative. For even in case of its failure, a descent of one species from another through heterogenetic generation is certainly very possible.
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