 In 1855 Fechner published a book much less famous than Nanna and Zend-Avesta but one just as important for the exposition of his philosophy: Über die physikalische und philosophische Atomlehre. While Nanna and Zend-Avesta make up the speculative or metaphysical side of Fechner’s philosophy, the Atomlehre represents its positivist side. It is in this work that Fechner puts forward his phenomenalism and verificationism. All that exists, and all that we can meaningfully talk about, it now turns out, is an object of possible experience. It is as if the soul of the universe were swept away with a positivist broom