CHAPTER XIX
HOW WE MADE THE WORLD TALK
THE SCRIBE'S NOTE ON CHAPTER NINETEEN
The discovery of radium is within the memory of all.
Many exaggerated statements went abroad at the outset, but the real facts are full of interest, and they have shed much new light on many subjects.
Three different kinds of radiation were found to be emitted by radium.
At first man could not tell what these were, so he named them after the first three letters of the Greek alphabet—Alpha, Beta, and Gamma, rays.