A great oil field had gone dry—and Asher, trapped far under the earth among the revolting Petrolia, learns why.

mpossible! What sort of creatures would they be, that could live two miles beneath the surface of the earth? Surely, Asher, you are joking!"

R. Briggs Johns, mighty power back of Stan-America Oil Corporation, looked at Blaine Asher closely, expecting to see the chief geologist and scientist of the company laugh. But Blaine Asher did not laugh. Serious, his rather thin face grave as he leaned his tall, muscular body above a torsion machine he was adjusting, there was nothing to indicate he had the faintest idea of a joke.

"Why damn it, Asher!" Johns insisted wrathfully, "you don't really mean that. And"—he took a nervous turn around the laboratory—"if such a wild thing were possible, what has that to do with our trouble? You haven't led me on to spend a million dollars drilling a thirty-six-inch hole, just so you could test a fantastic theory?"

"You know better than that." Asher wiped his hands and leaned against a table. Johns, looking into the cool gray eyes of the man before him, did know better. Blaine Asher was more than just a geologist or scientist. Well he might be termed a master geo-metallurgist. Johns nodded, wiping beads of perspiration from his brow.

"You say impossible—and want to know how those creatures cause this field, the largest oil field in the world, to start going bone dry over night. All right:

"Remember how you laughed when I told you that oil would some day be mined instead of pumped or flowed from the earth? You couldn't see how one central shaft could be sunk, then tunnels run back underneath the oil strata, tapping the sand from the bottom and letting the oil run down to be pumped out one shaft. Yet, that way, we would get all the oil, instead of the possible one-eighth of the total amount as we get by present methods.

"Now, you have seen that done. And you said that was impossible."