He had told her not to be frightened for him, since he was quite certain that, having been sick in the summer, he had acquired a degree of immunity to the second wave of contagion. He had also warned her that the tonics, potions, and remedies being touted for their flu-repellent properties were nothing more than quack medicine. Vinegar, quinine, spirits, morphia: all were useless. The only thing that worked, in his opinion, was frequent hand washing, avoidance of large gatherings, and the use of