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SIR JAMES JEANS opened a discussion on the evolution of the solar system on September 10 at the Blackpool meeting of the British Association. Prof. A. Holmes described the geological evidence concerning the age of the system; Prof. E. A. Milne discussed its dynamical aspects from the point of view of his recent work on the foundations of dynamics and gravitation; in the absence of Mr. R. A. Lyttleton, his binary star hypothesis of the origin of the system was described by Prof. W. H. McCrea; Prof. V. Bjerknes spoke on some hydrodynamical aspects; Dr. Harold Jeffreys stated some problems raised by the chemical composition of the planets, and summed up the discussion. Some of the points raised are summarized here.

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