It was not by accident that man conquered the Black Plague more easily than he conquered tuberculosis. The first appeared in terrifying waves of death that shook the whole of mankind, the other advances insidiously; the first induces terror, the other gradual indifference. The result is, however, that men opposed the first with all the energy they were capable of, whilst they try to arrest tuberculosis by feeble means. Thus man has mastered the Black Plague, while tuberculosis still gets the better of him.
