I jerked out my revolver; I reached over and gave Rhodes a shake that would have awakened Epimenides himself; then I grabbed the electric light and flashed it upon the descending monster.

I could scarcely believe my eyes. Nothing but the empty air. The monster had vanished.

"What's the matter?" came the sudden voice of Rhodes. "What in Paradise is going on now?"

I rubbed my eyes and stared upward once more.

"Look there!" said I, pointing. "Tell me, do you see nothing there?"

"There isn't anything there, Bill—now."

"But there was something there a second or two ago, and it didn't go away."

"Ergo it is still there," said Milton. "But, you see, it isn't. What did you see?"

"I wish I knew. I thought at first that it was a demon, phosphorescent or something. It was up there. I tell you it was up there. And it was coming down, coming down straight towards this very spot."

"Great Caesar's spook!" exclaimed Rhodes.