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The chance of the collision in question is proportional to tho relative velocity (v--p cos ~b) ; and in the stationary state the whole gain of energy is zero. Hence In the integration with respect to ~b the odd powers of cos ~b vanish. Hence 2qv P do e-h°'(q v2 --0 ~) = 0 ; so that as in (61) . Terling Place, Witham, August 19~ 1891.doi:10.1080/14786449108620208 fatcat:uvljpdol25dlhlme2xa7jemyze