Janský, a Czech serologist, neurologist and psychiatrist, tried to find a correlation between mental diseases and blood diseases. He found no such correlation, and published a study, the title of which translates as Hematological Study of Psychotics, which demonstrated that blood could be classified into four groups. He named these O, A, B, and AB. His work, published in a little-known journal, was at first overlooked, and in 1910 Moss independently published work on exactly similar lines. At the time Janský was unaware of the work of Karl Landsteiner, whose discovery of the A, B, and O blood types earned him the Nobel Prize in Physiology or Medicine in 1930. A French résumé of the paper is in the above journal, pp. 131-33, and a German summary in Jb. Neurol. Psychiat., 1907, 1028.