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To Dr. Paul H. DeKruif I am indebted not only for most of the bacteriological and medical material in this tale but equally for his help in the planning of the fable itself—for his realization of the characters as living people, for his philosophy as a scientist. With this acknowledgment I want to record our months of companionship while working on the book, in the United States, in the West Indies, in Panama, in London and Fontainebleau. I wish I could reproduce our talks along the way, and the laboratory afternoons, the restaurants at night, and the deck at dawn as we steamed into tropic ports.
Sinclair Lewis
