contrast, had thrived in his fa- ther's house. The boundless curiosity that his brother found so enervating, he found energizing. He soaked up experience, says Posnock, and converted it into fictions. Yet, the two were in fact not so very differ- ent. Henry, though younger, was in many ways the more mature of the two brothers. At least he grasped more rapidly the truth that thinking was doing. After reading Pragmatism (1907), he wrote to William, "I was lost in wonder of the extent to which...