|Contribution||b. Showed that milk microbes make lactic acid.|
|Notes||Also true of the microbe in laboratory culture. He described it as a yeast, but it was probably Streptococcus lactis. Did not cite Schwann or Latour(?). Challenged Liebig's chemical theory, which was then dominant. By addition of chalk, he showed that pH could determine the nature of the metabolic products.|
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