his book Eskimo Medicine Man, Dr. Otto George wrote about Foster’s role in the historic run. “[Foster] told me details of a diphtheria epidemic in Nome, to which he carried serum along with the mail. With the thermometer at 60 degrees below, or colder (the alcohol in the thermometer froze, and that should not occur until 72 below), Jones’s problem was to keep the serum from freezing. He modestly explained that he was only one of many who relayed the serum—thirty-five miles in his case—to Nome, and the man who was supposed to have the next-to-last leg of the journey passed his relief carrier
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