Our empirical criterion for a series of theories is that it should produce new facts. The idea of growth and the concept of empirical character are soldered into one.
So she went into the garden to cut a cabbage-leaf, to make an apple-pie; and at the same time a great she-bear, coming up the street, pops its head into the shop. 'What! no soap?' So he died, and she very imprudently married the barber.