11.
REFERENCES
259
E.——W. Makower and H. Geiger, Practical Measurements in
Radioactivity.
Longmans, Green and Co. (1912); pp.
80 to 88, 121 and 127.
F.——Hevesy and Paneth, Lehràuciz der Radioakiäviääz‘.
Barth
(1931).
G.—E. Rutherford, Radiaacfive Substances and Their Radiati0m.
Chapters VIH, and XI.