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 containers covered expected experiment fire flask flasks flies fly francesco fresh gauze generation gravy hatched heated high hypohesis hypothesis john laboratory lazzaro life maggot maggots meat microorganisms needham open pasteur placed redi redis remained rotting sealed signs soon spallanzani spallanzanis spontaneous swarming test

Lazzaro Spallanzani`s Experiment. Spontaneous Generation Royalty-Free Stock Photo


Lazzaro Spallanzani`s experiment. Spontaneous generation Stock Photo
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Lazzaro Spallanzani`s experiment. Spontaneous generation #178248423
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Heated but sealed flasks remained clear, without any signs of spontaneous growth, unless the flasks were subsequently opened to the air. This suggested that microbes were introduced into these flasks from the air