Nouveaux faits pour server à l’histoire de la levure lactique.

This and the preceding entry mark Pasteur’s commencement of the study of fermentation. This paper described Pasteur’s method of cultivating micro-organisms in a medium free of organic nitrogen to produce fermentations. The method was absolutely fundamental to his work, but not developed for his initial paper on lactic fermentation. He found that the conversion of sugar to lactic acid in fermentation is due to small corpuscles, isolated or grouped.