As he neared 50, large and lusty Writer Paul de Kruif felt his considerable powers waning. His customary four-mile trot along a Lake Michigan beach slowed down to a walk. Three or four hours with the double-bitted ax and cross-cut saw were all he could stand. He tired easily, slept fitfully, found himself a prey to causeless fears.
Youthful-looking Herman Bundesen, 63, unorthodox president of Chicago's board of health, suggested that De Kruif's decline might be due to a hormone deficiency. Dr. Bundesen believed that the vitality of men and animals is linked to...
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