Hallier seems, however, strongly inclined to disbelieve in the origin of these organisms by Heterogenesis or by Archebiosis.
This doctrine would leave the other more difficult problems,--as to the possible existence of supplementary modes of origin for such organisms by Heterogenesis or by Archebiosis--perfectly open questions.
Naturwissenschaftliche Wochenschrift published an article on "Heterogenesis and Evolution," which was to be followed later by a large work on this subject.
Indeed, until it has been cleared up somewhat, it is not very evident what good Experimentation onHeterogenesis can do.
Bastian by his exhibition of himself in dealing with heterogenesis writes himself down as incapable--as inadmissible in the character of a witness in a scientific investigation.
But even if seasonal dimorphism is to be ascribed to heterogenesis, it must by no means be asserted that those cases of cyclical propagation hitherto designated as heterogenesis are completely identical with seasonal dimorphism.
Metagenesis takes its origin from a phyletic series of dissimilar forms, whilstheterogenesis originates from a phyletic series of similar forms--this series, so far as we can at present judge, always consisting of similar sexual generations.
Their propagation would be considered to be parthenogenesis; and as it could not be denied that heterogenesis was here manifest, the mode of development of their particular kind of propagation might be proved, i.
But if we exclude heterogenesis there still remain a large number of cases of true metagenesis which cannot be explained from this point of view.
We have just been led to the comprehension of heterogenesis by cyclical heredity, by the fact that a cycle is produced whenever a series of generations exists under regularly alternating influences.
Should this be the case, it might be possible that from heterogenesis a mode of propagation would ultimately arise, which was apparently indistinguishable from pure metagenesis.
All fully developed species persist, but through heterogenesis a splitting up into new forms may take place, and this is accompanied by a disturbance of the vital equilibrium.
From time to time there have been observers who have maintained a belief in the opposite theory, to which the name heterogenesis has been given.
In accordance with the idea first introduced into science by Rudolph Leuckart, we have hitherto understood heterogenesis to be only the alternation of dissimilar sexual generations.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "heterogenesis" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: birth; development; generation; parthenogenesis; procreation
