Page 24 - Metaphysical questions of life

caught the dust par cles. Thus only clean air entered the flask minus
the dust. He closed the opening of the swan-shaped neck. Later he lt-
ed the flasks and let the liquid touch the contaminated walls of the
swan-neck where dust par cles were present. A er some me, he ex-
amined the liquid and saw organisms growing in the flask due to con-
tact with the dust par cles carrying bacteria in the swan-neck. This
proved that the living organisms in the liquid came from the outside

dust par cles carrying bacteria and not from the air itself. Pasteur
demonstrated that life comes from life, that is from bacteria and other
microscopic living en es, and not from clean air.

Pasteur disproved decisively the theory of spontaneous genera on. He
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