“…Already Sulzberger and M ayer (33) had reported, that guinea pigs fed in winter with a presumably vitamin-C deficient diet were more easily and regularly sensitized, such findings being confirmed later by other authors (4,34,35). These reports, as well as the general interest in the role of vitamins, inspired numerous authors in the 1930's to investigate the influence of various vitamins in the immune processes (13,18,22,28,31,32), but conflicting results were reported.…”