COMMUNICATION 71 above. Although Omelianovsky in 1956 opposed the Principle of Complementarity as a mechanistic understanding of 'duality3, in 1963 at the thirteenth World Philosophical Congress he accepted it as a dialectical statement of 'wave-particle duality9 with some reservations on the way in which it was applied.16 We may note the points of agreement among the three major trends: (1) They agree that causality can be retained in quantum theory, and (2) they reject B6hm?s approach as an attempt to return to classical concepts and classical determinism. In fact, Blokhintsev compares Bohm's attempt to "seeking unwettable gunpowder."17 There are other views among Soviet scientists. A A Tiapkin has suggestedl B that an approach could be made in terms of creating a newer and more complete theory, which, while not differing from the present theory in its predictions, would provide a more complete description of physical phenomena and deal especially with the gaps left by the Complementarity Principle between the moments of measurement. As a beginning, he has pointed out that even existing work by Feynman has shown that it is possible to specify the trajectory of a quantum object.19 Chinese material on this subject is not easily accessible, because of the censorship imposed by the Government of India and our libraries on this material. But discussions in Red Flag9'9 indicate that Chinese physicists and philosophers are doing serious work on these problems. Towards New Physics The further development of quantum physics, and the solution of its fundamental problems, is possible only by a comprehensive scientific investigation of all available facts and theories on the firm foundation of dialectical materialist philosophy. The scientist will be led astray in his field if idealist philosophy is allowed to intrude and distort scientific truth. Though science is instinctively materialist, idealist bourgeois philosophy tends to take cover behind scientific development. Those physicists who are not firmly grounded in dialectical materialist philosophy are led into what Lenin called "physical idealism55,21 idealism in the field of physics. This invariably leads to a crisis in physics. The essence of the crisis, in Lenin's words, "consists in the breakdown of the old laws and basic principles, in the rejection of an objective reality existing outside the mind, i.e. in the replacement of materialism by idealism and agnosticism.5922 The contention of the Copenhagen physicists that objective reality had disappeared reveals only their ignorance of dialectics; their ignorance that science, as it advances, does not disprove objective reality, but discovers new forms and deepens our knowledge of ^objective reality. Lenin noted that one school of natural scientists in one branch of natural science has slid into a reactionary philosophy, being unable to rise directly and at once from metaphysical materialism to dialectical materialism. This step is being made, and will be made, by modern physics; but