Footnote 164:
W. Friedrich, P. Knipping, and M. Laue, Ann. d. Phys., =41=, 971,
1913.
Footnote 165:
H. G. J. Moseley, Phil. Mag., =26=, 1024, 1913, and =27=, 703, 1914.
Footnote 166:
E. W. Morley and D. C. Miller, Phil. Mag., =9=, 680, 1905.
Footnote 167:
=17=, 891, 1905.
Footnote 168:
E. B. Wilson and G. N. Lewis, Proc. Am. Acad., of Arts and Sci., =48=,
389, 1912.
Footnote 169:
R. A. Millikan, Phys. Rev., =7=, 355, 1916.
Footnote 170:
E. Rutherford, Phil. Mag., =21=, 669, 1911.
Footnote 171: