"If he does not
want you I will keep you and you shall teach me to make sounds
like that."
At his request she sang again as they continued their way along
the winding tunnel, which was now lighted by occasional bulbs
which appeared to be similar to the radium bulbs with which she
was familiar and which were common to all the nations of Barsoom,
insofar as she knew, having been perfected at so remote a period
that their very origin was lost in antiquity. They consist,
usually, of a hemispherical bowl of heavy glass in which is
packed a compound containing what, according to John Carter, must
be radium. The bowl is then cemented into a metal plate with a
heavily insulated back and the whole affair set in the masonry of
wall or ceiling as desired, where it gives off light of greater
or less intensity, according to the composition of the filling
material, for an almost incalculable period of time.
As they proceeded they met a greater number of the inhabitants of
this underground world, and the girl noted that among many of
these the metal and harness were more ornate than had been those
of the workers in the fields above.
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