Points from Foregoing Letters

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    WHEN beryllium is bombarded by fast neutrons, a radioactive substance is produced of half-period about one second. New experiments by Dr. T. Bjerge show that it is a gaseous substance, probably helium of atomic mass six or five. The energy distribution of the (3-rays (electrons) emitted by this radioactive gas has been measured by Dr. T. Bjerge and Dr. K. J. Brostrom, and agrees with the view that the electrons arise during the transformation of helium atoms of mass six into lithium atoms of the same atomic mass.

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