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| c.1868 || || German botanist Ferdinand Cohn starts studying bacteria. From his accurate studies of their morphology, or bodily form, Cohn is among the first to attempt to arrange the different varieties of bacteria into genera and species on a systematic basis.<ref>{{cite web|title=Ferdinand Cohn|url=https://www.britannica.com/biography/Ferdinand-Cohn|website=britannica.com|accessdate=14 February 2018}}</ref> Cohn studies on algae and photosynthetic bacteria would lead him to describe several bacteria including Bacillus and Beggiatoa. The field of bacteriology is considered by many to have been founded by Ferdinand Cohn.<ref name="Introduction to Biotechnology"/> ||
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| 1872 || Scientific development || "The German botanist Brefeld reported growing fungal colonies from single spores on gelatin surfaces. Prior to this innovation that resulted in the isolation of pure culture of microorganisms, {{w|Joseph Schroeter}} grows pigmented bacterial colonies were isolated by the German biologist Schroeter on potato slices of potato incubated in a moist environment.<ref name="Textbook of Microbiology">{{cite book|last1=Kango|first1=Naveen|title=Textbook of Microbiology|url=https://books.google.com.ar/books?id=e1t6CF1OhhIC&pg=PA15&dq=%22pigmented+bacterial%22+%22Schroeter%22&hl=en&sa=X&ved=0ahUKEwix0oeA9bfaAhVGHpAKHbYZDX8Q6AEIJjAA#v=onepage&q=%22pigmented%20bacterial%22%20%22Schroeter%22&f=false}}</ref><ref>{{cite book|last1=Easter|first1=Martin C.|title=Rapid Microbiological Methods in the Pharmaceutical Industry|url=https://books.google.com.ar/books?id=Us7VfXfea80C&pg=PA7&dq=%22pigmented+bacterial%22+%22Schroeter%22&hl=en&sa=X&ved=0ahUKEwix0oeA9bfaAhVGHpAKHbYZDX8Q6AEIKzAB#v=onepage&q=%22pigmented%20bacterial%22%20%22Schroeter%22&f=false}}</ref><ref>{{cite book|last1=Grove|first1=David|title=Tapeworms, Lice, and Prions: A Compendium of Unpleasant Infections|url=https://books.google.com.ar/books?id=FHo9AgAAQBAJ&pg=PA190&dq=%22pigmented+bacterial%22+%22Schroeter%22&hl=en&sa=X&ved=0ahUKEwix0oeA9bfaAhVGHpAKHbYZDX8Q6AEIMDAC#v=onepage&q=%22pigmented%20bacterial%22%20%22Schroeter%22&f=false}}</ref><ref name="Significant Events By Years"/> ||
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| 1872 || Publication || {{w|Ferdinand Cohn}} publishes ''Untersuchungen ueber Bacterien'' (Investigations on Bacteria).<ref name="Bacteriology, c.1810-c.1917: Chronology of a Victorian Medical Advance"/> || {{w|Germany}}
