I held it to the light.

It was striated, streaked, as though little living, pulsing veins ran through it.

And its blueness, even in the vial, held an intensity of luminousness.
"Radioactive," said Marakinoff.

"Some liquid that is intensely radioactive; but what it is I know not at all.

Upon the living skin it acts like radium raised to the nth power and with an element most mysterious added.