Alchemy: Ancient and Modern / Being a Brief Account of the Alchemistic Doctrines, and Their Relations, to Mysticism on the One Hand, and to Recent Discoveries in Physical Science on the Other Hand; Together with Some Particulars Regarding the Lives and Teachings of the Most Noted Alchemists

by H. Stanley Redgrove

The Radium Emanation.

§ 93. We must now more fully consider the radium emanation—a substance with more astounding properties than even the radium compounds themselves. By distilling off the emanation from some radium bromide, and measuring the quantities of heat given off by the emanation and the radium salt respectively, Professors Rutherford and Barnes[109] proved that nearly three-fourths of the total amount of heat given out by a radium salt comes from the minute quantity of emanation that it contains. The amount of energy liberated as heat during the decay of the emanation is enormous; one cubic centimetre liberates about four million times as much heat as is obtained by the combustion of an equal volume of hydrogen. Undoubtedly this must indicate some profound change, and one may well ask, What is the ultimate product of the decomposition of the emanation?

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[109] E. Rutherford, F.R.S., and H. T. Barnes, D.Sc.: “Heating Effect of the Radium Emanation,” Philosophical Magazine [6], vol. vii. (1904), pp. 202 et seq.

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