9781422277652

Portrait of Marie Laurent Pasteur, taken in 1899.

Madame Pasteur (1826–1910) was a very supportive wife, and often assisted her famous husband in his scientific work.

Words to Understand

fermentation— chemical change of sugar to alcohol by yeasts and other similar kinds of chemical change by living organisms. microbe— a living organism so small that it cannot be seen with the naked eye. spontaneous generation— the theory that living organisms can originate from non-living matter.