Carl Kohler uses cocaine as a local anesthetic. Koch isolates the cholera bacillus. Benz develops first automobile to run on internal- combustion engine. Pasteur develops hydrophobia vaccine. R.H. Fitz identifies appendicitis.
Hertz produces radio waves.
1889 Eiffel Tower. James, Principles of Psychology . Koch develops tuberculin, which can be used to test for tuberculosis. Rudolf Diesel invents his namesake. Roentgen discovers X-rays.