the idea that microorganisms or biochemical compounds from space are responsible for originating life on the planet and possibly in other parts of the world in which suitable atmospheric circumstances occur.
The hypothesis that microorganisms may transfer life from space to habitable bodies; or perhaps the process of these types of transmission.
The doctrine associated with widespread circulation of germs, from which under positive circumstances bacteria, vibrios, etc., may develop.
The doctrine that all organisms must come from living parents; biogenesis; -- the exact opposite of natural generation.
The theory that life on the planet comes from spores or germs that developed somewhere else into the uiniverse; -- in contradistinction towards theory that life evolved in the world from inanimate matter. This theory, initially recommended by S. Arrhenius in 1907, is sometimes advanced by those that feel that the full time needed for evolution of life is too really miss life to possess developed on Earth from inanimate matter.