Глава XX. Сходство и различие между родом и видом

The similarity between genus and species is that both speak about many objects and answer the question: what is an object? that both are by nature prior to the concepts subordinate to them; that both one and the other are something whole (ὁλον τι). The difference between a genus and a species is that the genus has a greater community than the species; that a species has more variations than a genus; that the genus is synonymously expressed about the species, but the species is not expressed about the genus; that there cannot be the lowest genus (γενος ειδικωτατον), nor the highest species (ειδος γενικωτατον), just as the lowest concept will not be a genus. You might be interested in: