Cohn, Ferdinand (fĕrˈdĕnänt kōn) [key], 1828–98, German botanist. He is considered a founder of the science of bacteriology. From his early studies of microscopic life he developed theories of the bacterial causes of infectious disease and recognized bacteria as plants. He aided Robert Koch in preparing Koch's famous work on anthrax. Cohn's writings cover such diverse subjects as fungi, algae, insect epidemics, and plant diseases.
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