15.4.1890. My father dies. L.C. For those who do not know, those last two letters do not stand for Lower Case, but for Last Cigarette. This is an annotation I find in a volume by Ostwald on positivistic philosophy, with which, full of hope, I have spent many hours and never understood. No one would believe this, but, despite its brevity, that annotation records the most important event of my life.