What are some ancient theories before the cell theory?
The homunculus was a theoretical “little man” inside every sperm, later used in the discussion of conception and birth. In 1694, Nicolas Hartsoeker discovered “animalcules” in the semen of humans and other animals. This was the beginning of spermists’ theory, who held the belief that the sperm was in fact a “little man” (homunculus) that was placed inside a woman for growth into a child. This seemed to them to neatly explain many of the mysteries of conception. It was later pointed out that if the sperm was a homunculus, identical in all but size to an adult, then the homunculus may have sperm of its own. This led to a reductio ad absurdum, with a chain of homunculi “all the way down” to infinitesmial size. This was not necessarily considered by spermists a fatal objection, however, as it neatly explained how it was that “in Adam” all had sinned: the whole of humanity was already contained in his loins. The spermists’ theory also failed to explain why children tend to resemble their mo
