T he story I want to tell you begins in March 1926 and ends in April 1926. Early in March two separate theories existed: matrix mechanics and wave mechanics. At the end of April these two had merged into one theory, more powerful than the two parents taken separately. Wave mechanics was based upon three fundamental hypotheses: A. Stationary states are determined by complexvalued wave functions ...

Sir,?I was consulted in October 1926 by a Mahomedan boy, aged about 17 years, a faqir by profession, for painful swelling of both elbow joints. He gave the following history; that he had gone down with fever on the 10th September 1926 at Gujar Khan, a town in the north of the Punjab. This had developed into small-pox. The tenth day after the appearance of the eruption, pain and swelling set in ...