66 SOCIAL SCIENTIST this discussion. Otto Stern, in 1913, at the age of twentyfive, vowed that he would drop physics "if this nonsense proves to be true". Max von Laue, a farmer assistant of Planck, said, "Rubbish... the electron at the orbit must emit radiation." Einstein made the terse and rather prophetic remark: "No, this is remarkable! There is something behind it....'9 The question that came to the forefront was one of establishing a logical relationship between the quantum postulates and the classical mechanics. With the characteristic courage of a revolutionary, Bohr traced this relationship which he then called 'similarity considerations', later formulated as 'correspondence principle*. According to this principle, as we move from the microscopic world to the macroscopic world discreteness is gradually transformed into continuity; the quantum laws give way bit by bit to classical laws. The physical unity of nature is brilliantly confirmed since there are no border posts in nature declaring: , "Up to here the domain of Galileo, Newton and Kepler and from there the domain of Planck, Einstein and Bohr." The development of the theory was really bizzare. It survived by audacious ad hoc hypotheses put forth by its proponents to meet the classical challenge. Heisenberg admitted later, "We aimed our efforts not so much at deriving the correct mathematical relations as at making guesses about them, proceeding from their similarity to the formulas of the classical theory." Sommerfeld wrote to Einstein at the beginning of the twenties: "Every thing is going well but the basic foundations remain unclear." Another founder-contributor to the theory, Max Born said the foundation of Bohr's theory was quite mysterious. Einstein exclaimed, "If 1 only knew which nuts and bolts God uses here!" In 1924, de Broglie further confounded the confusion by postu-laing that just as radiation consisted of particles, matter displayed wave-like properties. The amazing hypothesis was confirmed in 1927. The idea of wave-corpuscular duality of both radiation and matter led to the development of wave mechanics and matrix mechanics by Schrodingcr and Heisenberg respectively. The breakdown of the integral picture of nature was complete, which made Bragg comment that physicists were reduced to thinking of light as waves on Mondays, Wednesdays and Fridays and as particles on Tuesdays, Thursdays and Saturdays. The two versions of the mechanics of the submicroscopic world were shown to be describing the same thing in different languages. But in the process of development of their respective theories, they intently hated each other's methods. Heisenberg wrote to a friend: "The more I think about the physical side of the Schrodinger theory the more revolting it seems to me." Schrodinger said, "Thisdifficult (Heisenberg) method seemed to me depressing if not revolting""" Despite the personal whims and predilections of the proponents of these ideas, the psi-function of Schordinger was given a probabilistic interpretation by Bohr and the matrix mechanics yielded yet another