The detonation of Peking's first atomic devices in recent months has X provoked renewed widespread discussion of the dangers of the further spread of nuclear weaponry. Speculation has flourished about who would be next—Sweden? Japan? Israel? Or perhaps India, which has become the first nonnuclear country to build a chemical separation plant? Cost estimates put nuclear weapons within reach of the poorest nations within a few years. Governments have issued solemn pronouncements about the need to design further international agreements to prevent nuclear proliferation. The President of the United States made use of a high-level committee to advise him how to deal with the problem.