Pic­tures Con­sid­ered #4 by Daniel P. Haeusser — Robert Koch is one of the key fig­ures in early bac­te­ri­ol­ogy, help­ing de­velop cul­ture tech­niques (e.g. solid me­dia), crit­i­cal rea­son­ing (e.g. Koch's pos­tu­lates), and dis­ease eti­ol­ogy (e.g.cholera and tu­ber­cu­lo­sis). He also pub­lished the first pho­tomi­cro­graphs of bac­te­ria (Fig­ure 1A) in his 1877 pa­per­Ver­fahren zur Un­ter­suchung, zum Con­servieren und Pho­tographiren…