aget and Durkin listened with open mouths. Radium meant but vague things to them. They had heard of radium paint which shone in the dark on the dials of watches and clothes, but of the properties of the metal and its salts they were utterly ignorant.
"That radium stuff is what makes the funny light in that mine, then?" asked Maget.
"Exactly. The radio-activity of the elements in the ore give off the light. There are three rays, the alpha, beta and gamma, and—"
The professor forgot himself in a lecture on the properties of radium.
Durkin, breaking in, asked, slyly. "Is this radium worth as much as silver?"
Young Kenneth Gurlone laughed, and even old Professor Gurlone smiled. "Radium is worth more than gold or diamonds or platinum. Its value is fabulous. We have five million dollars worth already, in the form of the chloride."
"Whew," whistled Durkin.
He glanced sidewise at Maget.
"Yes," said Professor Gurlone, "five million dollars worth of it! Those great monsters who have been developed throughout the ages by the action of the radium rays on their bodies, causing them to grow so prodigiously, are but incidents. We must destroy them, so that our work cannot be interfered with. We must use dynamite, blow them to bits. They are powerful enough to crush the stone bank by the mine mouth and ruin the labors of the past two years, gentlemen."
Armed, and once more fortified with whiskey, the five made their way outside. The moon was darkened by an immense shadow, as one of the giant bats winged its way over their heads. But there were no more monster frogs. The ugly, bulky shapes of the dead polywog and its parent lay before them.