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Francesco Redi's Hypothesis
He disapproved the idea of the Spontaneous Generation through the observation from his experiment. He placed fresh meat in o two differenct jars, one jar was left open and the other was covered with cloth. Days later, it resulted that the opened jar contained maggots, whereas the jar covered by cloth didn't. From this experiment, he claimed that maggots are formed by the eggs of the flies. -
John Needham's Experiment
Needham tried to challenge Redi's hypothesis by creating an experiment with broth and gravy. He boiled it to kill all microbes and poured it in a sealed jar. Few days later, the jar turned out to contain living things, and Needham argued that these had been created from non-life. -
Lazzaro Spallanzani's Experiment
Spallanzani recreated Needham's broth experiment by completely boiling it to kill all the microbes and divided into two separate jars. He left one of them completely sealed and the other left open. Later, he found out from the experiment that the sealed jar showed no signs of life whereas the other one contained small living things. Although there was an arguement among scientist that he didn't let the air in, in which microbes need to sustain life, he successfully proved Needham's mistake. -
Louis Pasteur's Experiment
Louis Pasteur wanted to test if life can be created from nothing, and this time, making sure that air was provided. He designed his own bottles and necks for his experiment, Pastuer exposed the brothes to air in his flasks, but nothing happened before he broke it to let living organisms admit to grow in the broth. Pastuer's experiment finally confirmed the disprovement theory on Spontaneous Generation