Immensely important philosopher of science (1902–1994). Collection of four ALSs in German to clinical psychologist and psychotherapist Christiane Meyer-Bornsen, totaling nine pages, dated throughout 1980. One letter, in part (translated): “Thank you, I was very worried when I realized…ride the motorcycle and, moreover, in black clothes, at night…I have the feeling that we are after such a short acquaintance understand, very well, and I look forward to seeing you again.” Another, in part (translated): “We are good, although my wife is very tired in the morning when she gets chemotherapy…The output is quite uncertain, since my wife is afraid before…But please, do not take it seriously, not to drive in dark clothes at night, incidentally, even after the consumption of alcohol.” The third, in part (translated): “It will be difficult, perhaps impossible, to go away from here but if at all possible…we should get away. I'm in the 79th year, and I feel so-so our geographically of nearest friend…is as old as I am, and lives 45 minutes away in car. Physiologically he is doing poorly the hospital in London, where my wife was treated…the situation is already very difficult. But if I become ill, or our old cleaning woman (3x a week 3 hours)…for any reason no longer comes, so it just goes no further…If but we leave here, so is probably Vienna the best solution. We have old friends there, and also some young friends.” The final letter contains details for an appointment in London and a small sketched map. In overall fine condition. RR Auction COA.