This is the heterogenesis of purpose.

But simple fission Has reproduced a different bliss, At last a heterogenesis!

During lunar phases in the spring and early summer, the clam worm undergoes "heterogenesis".

The theory of heterogenesis was a form of saltational evolution which Kölliker claimed functioned according to a general developmental law.

In 1864 Albert von Kölliker revived Geoffroy's theory that evolution proceeds by large steps, under the name of heterogenesis.

Bastian used the term "heterogenesis" for the process of spontaneous creation he believed was taking place constantly in nature, and which he claimed to have witnessed in his microscope.

Heterogenesis was applied to once-living materials such as boiled broths, and Henry Charlton Bastian proposed the term archebiosis for life originating from inorganic materials.

Another version of spontaneous generation is variously termed univocal generation, heterogenesis or xenogenesis, in which one form of life has been supposed to arise from a different form, such as tapeworms from the bodies of their hosts.

In some of his best known works he advanced the thesis that Marxism suffers what he called an "heterogenesis of ends," meaning that it is destined to triumph and self-destruct at the same time, due to its internal contradictions.

According to (Vucinich, 1988) the non-Darwinian evolution theory of Kölliker tied "organic transformism to three general ideas, all contray to Darwin's view: the multiple origin of living forms, the internal causes of variation, and "sudden leaps" (heterogenesis) in the evolutionary process."