The Disproval Of Spontaneous Generation :: essays research papers

From the beginning of time it was believed that living things could rise from nonliving things. This process was known as spontaneous generation. However, in the middle of the 17th century and past through the next 100 years, this idea was disproved by three important experiments. We now know that a nonliving object or group of objects plunder not turn into a living organism. Spontaneous generation is impossible in the atmosphere that we have today.In the early 1600s, people believed that living organisms could prepare from nonliving organisms. They proved this by saying that if a piece of meat was left out uncovered, that maggots would appear in a few days. These worms did not come from anything that they could see, so they assumed they came from the nonliving meat. In 1668, a man named Redi designed and completed an experiment that showed how this was not true. He took two pieces of raw meat, and left them out. He covered one so that nothing could get in, and left the other on e open. The open one grew maggots, and the covered one did not, proving that the dead meat did not produce the worms as they had previously thought.In the 1700s a man named Spallanzani proved Redis idea to a further extent. He noticed microbial growth on boiled pond water after being exposed to the air. To prove that this growth came from something living in the air, and not from the nonliving water, he designed an experiment. He boiled pond water to kill all the microbial growths. He then poured that water into two separate test tubes. He sealed one so that no air could get in, and left one open to the air. The one that was left open slowly became to a greater extent and more cloudy with microbial growths. The sealed tube stayed as clear as it had been when it was boiled. This experiment proved that the growths could not come from nonliving organisms, but had to have been transported at that place through the air. When Spallanzani presented his results to the public, he was criti cized. Other scientists said that he made the air unfit for living growth, and that they needed the air to change from nonliving to living.Pasteur did the third experiment, in 1862. He took Spallanzanis experiment, and the critics statements, and combined the two. He boiled pond water to kill all the living organisms.