Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Arthur Peter König (September 13, 1856, Krefeld October 26,1901, Berlin) devoted his short life to physiological optics. Born with congenital kyphosis he studied in Bonn and Heidelberg, moving to Berlin in the fall of 1879 where he studied under Hermann von Helmholtz, whose assistant he became in 1882. After obtaining a doctoral degree in 1882 he qualified for a professorial position in 1884. In 1890 he became director of the physical department of the Physiological Institute of the University of Berlin.