Prof. MUDr. Jan Janský (April 3, 1873, Prague – September 8, 1921) was a Czech serologist, neurologist and psychiatrist. He is credited with the first classification of blood into the four types (A, B, AB, O) of the ABO blood group system.
Jaroslav Heyrovský (1890-1967), Czech chemist and inventor. "for his discovery and development of the polarographic methods of analysis"
Monstrorum Historia by Ulisse Aldrovandi - Kunstkabinett