But they found nothing. The Plumie drive simply would not work.

They took Baird through the ship’s entire fabric. And their purpose, when it became clear, was startling. The Plumie ship had no rocket tubes. It had no beam-projectors except small-sized objects which were—which must be—their projectors of tractor and pressor beams. They were elaborately grounded to the ship’s substance. But they were not originally designed for ultra-heavy service. They hadn’t and couldn’t have the enormous capacity Baird had expected. He was astounded.

When he returned to the Niccola, he went instantly to the radar room to make sure that pictures taken through his scanner had turned out well. And there was Diane.

But the skipper’s voice boomed at him from the wall.

“Mr. Baird! What have you to add to the information you sent back?”

“Three items, sir,” said Baird. He drew a deep breath. “For the first, sir, the Plumie ship is unarmed. They’ve tractor and pressor beams for handling material. They probably use them to build their cairns. But they weren’t meant for weapons. The Plumies, sir, hadn’t a thing to fight with when they drove for us after we detected them.”

The skipper blinked hard.

“Are you sure of that, Mr. Baird?”

“Yes, sir,” said Baird uncomfortably. “The Plumie ship is an exploring ship—a survey ship, sir. You saw their mapping equipment. But when they spotted us, and we spotted them—they bluffed! When we fired rockets at them, they turned them back with tractor and pressor beams. They drove for us, sir, to try to destroy us with our own bombs, because they didn’t have any of their own.”

The skipper’s mouth opened and closed.

“Another item, sir,” said Baird more uncomfortably still. “They don’t use iron or steel. Every metal object I saw was either a bronze or a light metal. I suspect some of their equipment’s made of potassium, and I’m fairly sure they use sodium in the place of aluminum. Their atmosphere’s quite different from ours—obviously! They’d use bronze for their ship’s hull because they can venture into an oxygen atmosphere in a bronze ship. A sodium-hulled ship would be lighter, but it would burn in oxygen. Where there was moisture—”

The skipper blinked.

“But they couldn’t drive in a non-magnetic hull!” he 

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