It has since been shown that after this substance is removed from ferment-cells by pressure, and the liquid carefully filtered so that absolutely no cells remain, fermentation will yet take place.
"Makers of Modern Medicine"
James J. Walsh
It remained for Pasteur to demonstrate, as he did by a brilliant series of ingenious and conclusive experiments, that ferments are living cells, that they never originate except from previous cells of the same species, and that no fermentation takes place unless they are present.
"Makers of Modern Medicine"
James J. Walsh
The new explanation of fermentation greatly weakened the position of those who believed in spontaneous generation-that is, the origin of life from dead matter under certain specially favorable circumstances.
"Makers of Modern Medicine"
James J. Walsh