Polygenesis in his inventions may probably be regarded as testimony in favour of the monogenesis of Man.
monogenesis mon·o·gen·e·sis (mŏn'ə-jěn'ĭ-sĭs)
The theory that all living organisms are descended from a single cell or organism.
The production of similar organisms in successive generations.
Asexual reproduction, as by sporulation or parthenogenesis.
The process of parasitizing a single host, in or on which the entire life cycle of the parasite is passed.