"In recent years, theoretical physics have experienced a bewilderingly rapid development. It may certainly be said that the fruits obtained in the last half century surpass to a great extent the development in the passed several centuries. The world of physics by Newton and Maxwell which had been believed to be firm and unshakeable, was overthrown by the advent of the theories of relativity and quantum mechanics. The metaphysical view of matter based on immutable elements and indivisible atoms was radically changed."
