The author does not find that in the five years that have elapsed since his book was first issued under the title "The Great White Plague" any startling discovery has been made regarding either the nature or the cure of tuberculosis. Nor have the methods of fighting the disease been materially changed. The fight is more intense and is carried on with greater resources. The disease is steadily decreasing, and past success brings courage and hope. In the revision the form and substance of the book have been retained with only such changes as increasing knowledge have rendered necessary to bring it up to date.
Why Progress is Slow.
—In one of his aphorisms Wundt says that "men think very little and very seldom." The truth of this dictum is indisputable.... Herbert Spencer walked about London, notebook in hand, listening to and writing down the matter of the conversation of