Roentgen

The car in which Mr. Edison traveled was, of course, the flagship of the squadron, and I had the good fortune to be included among its inmates.

Here, besides several leading men of science from our own country, were Lord Kelvin, Lord Raleigh, Professor Roentgen, Dr. Moyson, the man who first made artificial diamonds, and several others whose fame had encircled the world.

Each of these men cherished hopes of wonderful discoveries along his line of investigation to be made in Mars.

An elaborate system of signals had, of course, to be devised for the control of the squadron.

He also made experiments from which he concluded that uranium rays undergo reflection, refraction, and polarization.

The work of other physicists, Elster and Geitel, Lord Kelvin, Schmidt, Rutherford, Beatty, and Smoluchowski, confirms and extends the results of the researches of M. Becquerel, with the exception of those relating to the reflection, refraction, and polarization of uranium rays, which in this respect behave like Roentgen rays, as has been recognized first by Mr. Rutherford and then by M. Becquerel himself.

End of section 1.

Section 2 of Radioactive Substances.

I have called radioactive those substances which generate emissions of this nature.

This name has since been adopted generally.

In their photographic and electric effects the Becquerel rays approximate to the Roentgen rays.

They also, like the latter, possess the faculty of penetrating all matter.