W. B. Yeats has created, if not a new world, a new star. He is not a reporter of life as it is, to the extent that Shakespeare or Browning is. One is not quite certain that his kingdom is of the green earth. He is like a man who has seen the earth not directly but in a crystal.
Up to 90% of the total decline in the death rate of children between 1860-1965 because of whooping cough, scarlet fever, diphtheria, and measles occurred before the introduction of immunisations and antibiotics.