Ferdinand J. Cohn contributes to the founding of the science of bacteriology. He publishes an early classification of bacteria using the genus name Bacillus for the first time.
Cohn, F., 1875. Untersuchungen ueber Bakterien. Beitraege zur Biologie der Planzen 1:127-222 In Milestones in Microbiology: 1556 to 1940, translated and edited by Thomas D. Brock, ASM Press. 1998, p210 [pdf]
Ferdinand Cohn, a Founder of Modern Microbiology, ASM News 65. 1999.p.547