It
is a marvellous fact—judging by the limited experience which has thus
far been possible—that the metamorphosing activities of Radium-rays
seem to be inexhaustible by time, or use. They appear to emit a
something which is almost, if not altogether, identical with vitality,
as distinct from any such physical manifestations as heat, light, and
electricity. How, and why the effects are produced, no scientist, or
physician can yet say. The influence at work seems almost akin to the "
Iodic " force which was so much discussed in the first half of the
nineteenth century. But its efficacy is strictly practical, and
objective ; not depending on mental suggestion in the least degree. The
" Radioactivity," as it is termed, is understood to signify an occult
property shown by the class of newly-recognised substances, of which
Uranium, Thorium, and Radium are the best known examples ; each of
which spontaneously emanates a special type of radiations. Very
remarkable are the colouring effects of the (Becquerel) rays upon
Diamonds; which Precious Stones, when " off colour," may be converted
again by these rays into stones of the finest water. The much-prized
blue tint can be thus imparted, and other similar wonders wrought.
Furthermore, true Diamonds can be recognised by means of these rays.
If going into a dark room, provided with a small quantity of
Radium-bromide, and bringing this near a Diamond ornament, the Stone
will at once glow with a bluish light. If the ornament includes other
stones, such as Rubies, these will appear quite black. A ring
consisting of Diamonds, and Rubies alternately, shows this very
effectively. The Diamonds shine out brilliantly, while the spaces
between them filled by Rubies are dark. Imitation Diamonds do
