7
302. Pegram, Phys. Rev. p. 424, December, 1903.
8
303. Miss Slater, Phil. Mag. 1905.
9
304. von Lerch, Ann. de d. Phys. November, 1903.
10
305. The ‘rayless change’ certainly does not give out α rays, and special experiments showed that no appreciable amount of β rays were present. On the other hand, the second change gives out all three types of rays.
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306. Miss Brooks, Phil. Mag. Sept. 1904.