Abstract
On June 26, 1943, the scientific world lost one of its greatest men. Karl Landsteiner, stricken in his laboratory two days before, succumbed to a heart attack. While it may be true that mortal man should not deplore a quick merciful death coming in the midst of full activity after the lapse of seventy-five years of life, the greater part of them devoted to scientific work which will remain as an imperishable monument, yet we who knew him can not entirely conceal our sadness. For, no matter what age the biography1 may record, Karl Landsteiner's mind was as young, as fertile, as flexible, on that fatal day in 1943, as when he first began his career. The world of science lost an extraordinarily versatile genius of profound capacity and Landsteiner's friends lost a charming and genial personality, whose wit and modesty, whose inspiring qualities and distinguished demeanor will always be fresh in their memories.
