ABSTRACT
Philosophical Magazine shows that the radioactive emanation from thorium passes in unchanged amount through a white-hot platinum tube and through a tube cooled to the temperature of solid carbon dioxide. The determinations in an oxygen stream of 0 58 cc per second, the radium emanation commenced to volatilize at 155 and some of the thorium emanation escapes condensation at 155 5C. It observes that some of the thorium emanation was condensed at temperatures as much as 30 above the point of complete condensation. The thorium emanation this decays practically to zero before the next observation is taken, but in the case of the radium emanation it does not, and is added to the amount removed at the exhaustion. The new properties, takes in conjunction with the earlier discovered diffusion phenomena, characteristic of the radioactive emanations, leave no doubt that the latter must consist of matter in the gaseous state.
