Hermann Emil Fischer
The years from 1896 to 1898 Nikolai Kravkov spent in practical trainings in different European countries (Germany, Austria-Hungary, France, Italy and Switzerland). In Berlin he attended the lectures of Hermann Emil Fischer, in Strasbourg he worked in Friedrich von Recklinghausen's laboratory and attended the lectures of Friedrich Goltz. His practical training in the Strasbourg laboratory of Oswald Schmiedeberg, the founder of modern experimental pharmacology, influenced greatly upon his further work.