His warning was superfluous. All present had experienced the trembling at the same time, a violent, insistent rocking of the soil beneath their feet. Now gaunt Titanians, panic-stricken, were fleeing in all directions. Grossman had stumbled and fallen to his knees. Rocky bent over him, lifted him by main force and howled into his ear,
"A roller, Grossman! You must have a private roller somewhere around here! Where is it?"
"O-over there!" The Factor pointed uncertainly at a gray bulk dim in the gloom.
"Then come on!" snapped Rocky. "We've got to get to New Boston!"
"N-new Boston? The city? But—but why? We want to get to the Patrol Base—"
"New Boston," Rocky grated, "first. That's where you sent Lynn Graham—remember? Gad! I didn't think he could do it! But he is! Start this roller, Gros
