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'And so,' said the professor, 'we see that this Radium, which
seemed at first a fantastic exception, a mad inversion of all
that was most established and fundamental in the constitution of
matter, is really at one with the rest of the elements. It does
noticeably and forcibly what probably all the other elements are
doing with an imperceptible slowness. It is like the single
voice crying aloud that betrays the silent breathing multitude in
the darkness. Radium is an element that is breaking up and flying
to pieces. But perhaps all elements are doing that at less
perceptible rates. Uranium certainly is; thorium--the stuff of
this incandescent gas mantle--certainly is; actinium. I feel
that we are but beginning the list. And we know now that the
atom, that once we thought hard and impenetrable, and indivisible
and final and--lifeless--lifeless, is really a reservoir of
immense energy. That is the most wonderful thing about all this
work. A little while ago we thought of the atoms as we thought
of bricks, as solid building material, as substantial matter, as
unit masses of lifeless stuff, and behold! these bricks are
boxes, treasure boxes, boxes full of the intensest force. This
little bottle contains about a pint of uranium oxide; that is to
say, about fourteen ounces of the element uranium. It is worth
about a pound. And in this bottle, ladies and gentlemen, in the
atoms in this bottle there slumbers at least as much energy as we
could get by burning a hundred and sixty tons of coal. If at a
word, in one instant I could suddenly release that energy here
and now it would blow us and everything about us to fragments; if
I could turn it into the machinery that lights this city, it
could keep Edinburgh brightly lit for a week. But at present no
man knows, no man has an inkling of how this little lump of stuff
can be made to hasten the release of its store. It does release
it, as a burn trickles. Slowly the uranium changes into radium,
the radium changes into a gas called the radium emanation, and
that again to what we call radium A, and so the process goes on,
giving out energy at every stage, until at last we reach the last
stage of all, which is, so far as we can tell at present, lead.
But we cannot hasten it.'
'I take ye, man,' whispered the chuckle-headed lad, with his red
hands tightening like a vice upon his knee. 'I take ye, man. Go
on! Oh, go on!'
The professor went on after a little pause. 'Why is the change
gradual?' he asked. 'Why does only a minute fraction of the
radium disintegrate in any particular second? Why does it dole
itself out so slowly and so exactly? Why does not all the
uranium change to radium and all the radium change to the next
lowest thing at once? Why this decay by driblets; why not a decay
en masse? . . . Suppose presently we find it is possible to
quicken that decay?'
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