They halted before two lawn chairs.

"Let's sit down here," invited Russ. "I can tell it to you out here, show it to you afterward. It isn't often I can be outdoors."

"It is a fine place," said Greg. "I can smell the pines."

The laboratory perched on a ledge of rugged rock, nearly 7,000 feet above sea level. Before them the land swept down in jagged ruggedness to a valley far below, where a stream flashed in the noonday sun. Beyond climbed pine-clad slopes and far in the distance gleamed shimmering spires of snow-capped peaks.

From his leather jacket Russ hauled forth his pipe and tobacco, lighted up.

"It was this way," he said. Leaning back comfortably he outlined the first experiment. Manning listened intently.

"Now comes the funny part," Russ added. "I had hopes before, but I believe this is what put me on the right track. I took a metal rod, a welding rod, you know. I pushed it into that solidified force field, if that is what you'd call it ... although that doesn't describe it. The rod went in. Took a lot of pushing, but it went in. And though the field seemed entirely transparent, you couldn't see the rod, even after I had pushed enough of it in so it should have come out the other side. It was as if it hadn't entered the sphere of force at all. As if I were just telescoping the rod and its density were increasing as I pushed, like pushing it back into itself, but that, of course, wouldn't have been possible."

He paused and puffed at his pipe, his eyes fixed on the snowy peaks far in the purple distance. Manning waited.

"Finally the rod came out," Russ went on. "Mind you, it came out, even after I would have sworn, if I had relied alone upon my eyes, that it hadn't entered the sphere at all. But it came out ninety degrees removed from its point of entry!"

"Wait a second," said Manning. "This doesn't check. Did you do it more than once?"