Koch's Tuberculin : for the diagnosis of tuberculosis in cattle : tested, before being issued, by the State Control Board at the Royal Prussian Institute for Experimental Therapeutics in Frankfort o/M. (Director: prof. Dr. P. Ehrlich) : prepared in the serum department of E. Merck, Darmstadt.

Licence: Public Domain Mark

Credit: Koch's Tuberculin : for the diagnosis of tuberculosis in cattle : tested, before being issued, by the State Control Board at the Royal Prussian Institute for Experimental Therapeutics in Frankfort o/M. (Director: prof. Dr. P. Ehrlich) : prepared in the serum department of E. Merck, Darmstadt. Source: Wellcome Collection.