About Johannes Purkinje:
Jan Evangelista Purkyn? was a Czech anatomist and physiologist. He was one of the best known scientists of his time. In 1839, he coined the term 'protoplasm' for the fluid substance of a cell. His son was the painter Karel Purkyn?. Such was his fame that when people from outside Europe wrote letters to him, all that they needed to put as the address was "Purkyn?, Europe".