CHAPTER VIII
Abbott. _The Sun._ 1910. Arrhenius. _The Life of the Universe_, Vol. II, p. 193. Helmholtz. _Phil. Mag._, p. 516. 1856. Rutherford and Soddy. _Phil. Mag._ May, 1903.
Abbott. _The Sun._ 1910. Arrhenius. _The Life of the Universe_, Vol. II, p. 193. Helmholtz. _Phil. Mag._, p. 516. 1856. Rutherford and Soddy. _Phil. Mag._ May, 1903.