Marks was not unconscious, but his stare was fixed. "Are you all right, sir?" the boy asked anxiously.

The reply was unintelligible.

Scotty bent over the scientist, too. "Are you all right, sir?" he repeated urgently.

Marks' fixed stare never wavered. A spate of words poured from him, but they made no sense. Now and then a single word emerged clearly. Once it was "July," then "soup kettle" and "Planck's constant."

"Just like the others," Tom Dodd said helplessly.

Rick listened with horror. He had no doubt, no doubt at all. Steve had described it accurately, and here it was. Marks was a victim of the identical ailment that had stricken the other team members!


CHAPTER IX

Dagger of the Mind