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Without exception they were ornithopters; that is, machines built on the bird-wing principle, sustaining themselves by a flapping motion rather than by air-pressure due to a propeller. Their size varied from one-seater affairs of very small size to craft large enough to hold a score. Most were gaudily painted. The surgeon's own machine was a two-seater, small but powerful in design.

He hardly looked up as at some signal one of their own ornithopters slid below and the three ambassadors of Rahn prepared to go over the side. But Jacaro snarled out of one corner of his mouth. "These guys are takin' each other's words. Maybe that's all right, but I'm warnin' you, if there's any double-crossin'...." He was gone. The Keeper of Foodstuffs touched Tommy's shoulder.

One flash struck the wingtip of their plane, and flame burst out, but Aten flung the ship into a mad whirl in which the blaze was blown out. Another freight ship helpless and another. Then the air fleet of Rahn turned and fled. The ornithopters winged away in heavy, creaking terror. The others dived for speed and flattened out hardly above the tree-fern jungle.

The ornithopters with their racket would start later, so the planes would be soaring above Rahn before their presence was even suspected. The rest of the fleet flew in darkness. The flight above the jungle would have been awe-inspiring at another time. There were the stars above, nearer and brighter than those of Earth. There was no Milky Way in the firmament of this universe.

Ornithopters, machines which endeavour to reproduce the natural flight of birds. Aeroplanes, which are merely inclined planes like kites, but towed or driven by screws. Each of these systems has had and still has it partisans obstinately resolved to give way in not the slightest particular. However, Robur, for many reasons, had rejected the two first.

The ornithopters came squeaking and rattling in their heavy flight just as the dull-red sun of this world peered above the horizon. The tree-fern fronds waved languidly in the morning breeze.

Tommy counted three of the clumsy ornithopters, high and motelike. There were twenty or thirty of the small, one-man craft. There were a dozen or more two-man planes. And there were at least forty giant single-wing ships which looked as if they had been made for carrying freight. They soared and circled above the city in soundless confusion.