Spontaneous generation: life arises from non‑living matter

The English Catholic priest claimed to have demonstrated the validity of the theory of spontaneous generation after observing the growth of small organisms in some chicken broth placed in sealed flasks and heated for 30 minutes.

Among these ideas, for centuries, since at least the time of Aristotle (4th Century BC), people (including scientists) believed that simple living organisms could come into being by spontaneous generation. This was the idea that non-living objects can give rise to living organisms.

Louis Pasteur Spontaneous generation is the idea that living things could arise from decaying, non-living matter. This idea was generally accepted from the time of Aristotle, through the Middle Ages, until the late 19th century. Given the widely accepted religious and cultural beliefs of these ...

However, one of van Helmont’s contemporaries, Italian physician Francesco Redi (1626–1697), performed an experiment in 1668 that was one of the first to refute the idea that maggots (the larvae of flies) spontaneously generate on meat left out in the open air. He predicted that preventing flies from having direct contact with the meat would also prevent the appearance of maggots. Redi left meat in each of six containers (Figure 2.2). Two were open to the air, two were covered with gauze, and two were tightly sealed. His hypothesis was supported when maggots developed in the uncovered jars, but no maggots appeared in either the gauze-covered or the tightly sealed jars.

Spontaneous generation is a superseded scientific theory that held that living creatures could arise from non-living matter and that such processes were commonplace and regular. It was hypothesized that certain forms, such as fleas, could arise from inanimate matter such as dust, or that maggots ...

Today spontaneous generation is generally accepted to have been decisively dispelled during the 19th century by the experiments of Louis Pasteur.

However, one of van Helmont’s contemporaries, Italian physician Francesco Redi (1626–1697), performed an experiment in 1668 that was one of the first to refute the idea that maggots (the larvae of flies) spontaneously generate on meat left out in the open air.

It is a false idea that was once ... were so strong that it took multiple experiments by several different scientists to disprove the theory and start to shift the mindset about how living things arise....

Proponents of spontaneous generation dismissed this, arguing that the extended boiling had destroyed the “vital force” and the melted seal prevented the entry of fresh air necessary for life to form.